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Verify a Solution of an Equation

In the following exercises, determine whether the given value is a solution to the equation.

Is y = 5 3 a solution of
6 y + 10 = 12 y ?

yes

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Is x = 9 4 a solution of
4 x + 9 = 8 x ?

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Is u = 1 2 a solution of
8 u 1 = 6 u ?

no

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Is v = 1 3 a solution of
9 v 2 = 3 v ?

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Solve Equations using the Subtraction and Addition Properties of Equality

In the following exercises, solve each equation using the Subtraction and Addition Properties of Equality.

y + 45 = −66

y = −111

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p + 2.4 = −9.3

p = −11.7

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m 18 = −200

m = −182

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x 165 = −420

x = −255

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z + 0.52 = −8.5

z = −9.02

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q + 3 4 = 1 2

q = 1 4

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p 2 5 = 2 3

p = 16 15

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Solve Equations that Require Simplification

In the following exercises, solve each equation.

c + 31 10 = 46

c = 25

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9 x + 5 8 x + 14 = 20

x = 1

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6 x + 8 5 x + 16 = 32

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−6 x 11 + 7 x 5 = −16

x = 0

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−8 n 17 + 9 n 4 = −41

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5 ( y 6 ) 4 y = −6

y = 8 y = 24

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9 ( y 2 ) 8 y = −16

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8 ( u + 1.5 ) 7 u = 4.9

u = −7.1

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5 ( w + 2.2 ) 4 w = 9.3

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6 a 5 ( a 2 ) + 9 = −11

a = −30

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8 c 7 ( c 3 ) + 4 = −16

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6 ( y 2 ) 5 y = 4 ( y + 3 )
4 ( y 1 )

y = 28

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9 ( x 1 ) 8 x = −3 ( x + 5 )
+ 3 ( x 5 )

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3 ( 5 n 1 ) 14 n + 9
= 10 ( n 4 ) 6 n 4 ( n + 1 )

n = −50

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2 ( 8 m + 3 ) 15 m 4
= 9 ( m + 6 ) 2 ( m 1 ) 7 m

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( j + 2 ) + 2 j 1 = 5

j = 8

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( k + 7 ) + 2 k + 8 = 7

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( 1 4 a 3 4 ) + 5 4 a = −2

a = 11 4

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( 2 3 d 1 3 ) + 5 3 d = −4

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8 ( 4 x + 5 ) 5 ( 6 x ) x
= 53 6 ( x + 1 ) + 3 ( 2 x + 2 )

x = 13

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6 ( 9 y 1 ) 10 ( 5 y ) 3 y
= 22 4 ( 2 y 12 ) + 8 ( y 6 )

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Translate to an Equation and Solve

In the following exercises, translate to an equation and then solve it.

Nine more than x is equal to 52.

x + 9 = 52 ; x = 43

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The sum of x and −15 is 23.

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Ten less than m is −14 .

m 10 = −14 ; m = −4

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Three less than y is −19 .

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The sum of y and −30 is 40.

y + ( −30 ) = 40 ; y = 70

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Twelve more than p is equal to 67.

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The difference of 9 x and 8 x is 107.

9 x 8 x = 107 ; 107

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The difference of 5 c and 4 c is 602.

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The difference of n and 1 6 is 1 2 .

n 1 6 = 1 2 ; 2 3

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The difference of f and 1 3 is 1 12 .

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The sum of −4 n and 5 n is −82 .

−4 n + 5 n = −82 ; 82

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The sum of −9 m and 10 m is −95 .

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Translate and Solve Applications

In the following exercises, translate into an equation and solve.

Distance Avril rode her bike a total of 18 miles, from home to the library and then to the beach. The distance from Avril’s house to the library is 7 miles. What is the distance from the library to the beach?

11 miles

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Reading Jeff read a total of 54 pages in his History and Sociology textbooks. He read 41 pages in his History textbook. How many pages did he read in his Sociology textbook?

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Age Eva’s daughter is 15 years younger than her son. Eva’s son is 22 years old. How old is her daughter?

7 years old

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Age Pablo’s father is 3 years older than his mother. Pablo’s mother is 42 years old. How old is his father?

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Groceries For a family birthday dinner, Celeste bought a turkey that weighed 5 pounds less than the one she bought for Thanksgiving. The birthday turkey weighed 16 pounds. How much did the Thanksgiving turkey weigh?

21 pounds

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Weight Allie weighs 8 pounds less than her twin sister Lorrie. Allie weighs 124 pounds. How much does Lorrie weigh?

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Health Connor’s temperature was 0.7 degrees higher this morning than it had been last night. His temperature this morning was 101.2 degrees. What was his temperature last night?

100.5 degrees

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Health The nurse reported that Tricia’s daughter had gained 4.2 pounds since her last checkup and now weighs 31.6 pounds. How much did Tricia’s daughter weigh at her last checkup?

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Salary Ron’s paycheck this week was $17.43 less than his paycheck last week. His paycheck this week was $103.76. How much was Ron’s paycheck last week?

$121.19

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Textbooks Melissa’s math book cost $22.85 less than her art book cost. Her math book cost $93.75. How much did her art book cost?

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Everyday math

Construction Miguel wants to drill a hole for a 5 8 inch screw. The hole should be 1 12 inch smaller than the screw. Let d equal the size of the hole he should drill. Solve the equation d 1 12 = 5 8 to see what size the hole should be.

d = 17 24 inch

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Baking Kelsey needs 2 3 cup of sugar for the cookie recipe she wants to make. She only has 3 8 cup of sugar and will borrow the rest from her neighbor. Let s equal the amount of sugar she will borrow. Solve the equation 3 8 + s = 2 3 to find the amount of sugar she should ask to borrow.

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Writing exercises

Is −8 a solution to the equation 3 x = 16 5 x ? How do you know?

No. Justifications will vary.

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What is the first step in your solution to the equation 10 x + 2 = 4 x + 26 ?

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Self check

After completing the exercises, use this checklist to evaluate your mastery of the objectives of this section.

This is a table that has six rows and four columns. In the first row, which is a header row, the cells read from left to right “I can…,” “Confidently,” “With some help,” and “No-I don’t get it!” The first column below “I can…” reads “verify a solution of an equation,” “solve equations using the subtraction and addition properties of equality,” “solve equations that require simplification,” “translate to an equation and solve,” and “translate and solve applications.” The rest of the cells are blank.

If most of your checks were:

…confidently. Congratulations! You have achieved your goals in this section! Reflect on the study skills you used so that you can continue to use them. What did you do to become confident of your ability to do these things? Be specific!

…with some help. This must be addressed quickly as topics you do not master become potholes in your road to success. Math is sequential - every topic builds upon previous work. It is important to make sure you have a strong foundation before you move on. Who can you ask for help? Your fellow classmates and instructor are good resources. Is there a place on campus where math tutors are available? Can your study skills be improved?

…no - I don’t get it! This is critical and you must not ignore it. You need to get help immediately or you will quickly be overwhelmed. See your instructor as soon as possible to discuss your situation. Together you can come up with a plan to get you the help you need.

Questions & Answers

differentiate between demand and supply giving examples
Lambiv Reply
differentiated between demand and supply using examples
Lambiv
what is labour ?
Lambiv
how will I do?
Venny Reply
how is the graph works?I don't fully understand
Rezat Reply
information
Eliyee
devaluation
Eliyee
t
WARKISA
hi guys good evening to all
Lambiv
multiple choice question
Aster Reply
appreciation
Eliyee
explain perfect market
Lindiwe Reply
In economics, a perfect market refers to a theoretical construct where all participants have perfect information, goods are homogenous, there are no barriers to entry or exit, and prices are determined solely by supply and demand. It's an idealized model used for analysis,
Ezea
What is ceteris paribus?
Shukri Reply
other things being equal
AI-Robot
When MP₁ becomes negative, TP start to decline. Extuples Suppose that the short-run production function of certain cut-flower firm is given by: Q=4KL-0.6K2 - 0.112 • Where is quantity of cut flower produced, I is labour input and K is fixed capital input (K-5). Determine the average product of lab
Kelo
Extuples Suppose that the short-run production function of certain cut-flower firm is given by: Q=4KL-0.6K2 - 0.112 • Where is quantity of cut flower produced, I is labour input and K is fixed capital input (K-5). Determine the average product of labour (APL) and marginal product of labour (MPL)
Kelo
yes,thank you
Shukri
Can I ask you other question?
Shukri
what is monopoly mean?
Habtamu Reply
What is different between quantity demand and demand?
Shukri Reply
Quantity demanded refers to the specific amount of a good or service that consumers are willing and able to purchase at a give price and within a specific time period. Demand, on the other hand, is a broader concept that encompasses the entire relationship between price and quantity demanded
Ezea
ok
Shukri
how do you save a country economic situation when it's falling apart
Lilia Reply
what is the difference between economic growth and development
Fiker Reply
Economic growth as an increase in the production and consumption of goods and services within an economy.but Economic development as a broader concept that encompasses not only economic growth but also social & human well being.
Shukri
production function means
Jabir
What do you think is more important to focus on when considering inequality ?
Abdisa Reply
any question about economics?
Awais Reply
sir...I just want to ask one question... Define the term contract curve? if you are free please help me to find this answer 🙏
Asui
it is a curve that we get after connecting the pareto optimal combinations of two consumers after their mutually beneficial trade offs
Awais
thank you so much 👍 sir
Asui
In economics, the contract curve refers to the set of points in an Edgeworth box diagram where both parties involved in a trade cannot be made better off without making one of them worse off. It represents the Pareto efficient allocations of goods between two individuals or entities, where neither p
Cornelius
In economics, the contract curve refers to the set of points in an Edgeworth box diagram where both parties involved in a trade cannot be made better off without making one of them worse off. It represents the Pareto efficient allocations of goods between two individuals or entities,
Cornelius
Suppose a consumer consuming two commodities X and Y has The following utility function u=X0.4 Y0.6. If the price of the X and Y are 2 and 3 respectively and income Constraint is birr 50. A,Calculate quantities of x and y which maximize utility. B,Calculate value of Lagrange multiplier. C,Calculate quantities of X and Y consumed with a given price. D,alculate optimum level of output .
Feyisa Reply
Answer
Feyisa
c
Jabir
the market for lemon has 10 potential consumers, each having an individual demand curve p=101-10Qi, where p is price in dollar's per cup and Qi is the number of cups demanded per week by the i th consumer.Find the market demand curve using algebra. Draw an individual demand curve and the market dema
Gsbwnw Reply
suppose the production function is given by ( L, K)=L¼K¾.assuming capital is fixed find APL and MPL. consider the following short run production function:Q=6L²-0.4L³ a) find the value of L that maximizes output b)find the value of L that maximizes marginal product
Abdureman
types of unemployment
Yomi Reply
What is the difference between perfect competition and monopolistic competition?
Mohammed
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Practice Key Terms 1

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Source:  OpenStax, Elementary algebra. OpenStax CNX. Jan 18, 2017 Download for free at http://cnx.org/content/col12116/1.2
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