<< Chapter < Page Chapter >> Page >

Ondersoek: veranderlikes en konstantes.

Identifiseer die veranderlikes en die konstantes in die volgende vergelykings:

  1. 2 x 2 = 1
  2. 3 x + 4 y = 7
  3. y = - 5 x
  4. y = 7 x - 2

Relasies en funksies

In die verlede het jy gesien veranderlikes kan relasies (verhoudings) hê met mekaar. Byvoorbeeld, Anton is 2 jaar ouer as Naomi. Die relasie of verband tussen die ouderdomme van Anton en Naomi kan geskryf word as A = N + 2 , waar Anton se ouderdom voorgestel word met A en Naomi se ouderdom voorgestel word met N .

In die algemeen is 'n relasie 'n vergelyking met twee veranderlikes. Byvoorbeeld, y = 5 x en y 2 + x 2 = 5 is relasies. In albei voorbeelde is x en y veranderlikes en 5 is 'n konstante. Vir elke waarde van x sal jy 'n ander, unieke waarde vir y kry.

Mens hoef nie relasies as vergelykings te skryf nie, dit kan ook weergegee word in woorde, tabelle of grafieke. Byvoorbeeld, in plaas van y = 5 x te skryf, kan mens sê “ y is vyf keer so groot as x ”. Ons kan ook die volgende tabel gee:

x y = 5 x
2 10
6 30
8 40
13 65
15 75

Ondersoek: relasies en funksies

Voltooi die volgende tabel vir die gegewe funksies:

x y = x y = 2 x y = x + 2

Die cartesiese vlak

Wanneer ons met funksies met reële getalle werk, is ons vernaamste stuk gereedskap 'n grafiek. Eerstens, indien ons twee reële veranderlikes het, x en y , kan ons gelyktydig vir hulle waardes toeken. Byvoorbeeld, ons kan sê " x is 5 en y is 3”. Net soos wat ons vir " x is 5” verkort deur te skryf " x = 5 ”, kan ons ook “ x is 5 en y is 3” verkort deur te sê “ ( x ; y ) = ( 5 ; 3 ) ”. Gewoonlik as ons dink aan reële getalle, dink ons aan 'n oneindige lang lyn en 'n getal as 'n punt op die lyn. Indien ons twee getalle op dieselfde tyd kies, kan ons iets soortgelyks doen, maar nou gebruik ons twee dimensies. Ons gebruik nou twee lyne, een vir x en een vir y , met die lyn vir y , geroteer, soos in [link] .Ons noem dit die Cartesiese vlak .

Die Cartesiese vlak bestaan uit 'n x - as (horisontaal) en 'n y - as (vertikaal).

Teken van grafieke

Om 'n grafiek van 'n funksie te teken, moet ons 'n paar punte bereken en stip op die Cartesiese vlak. Die punte word dan in volgorde verbind om 'n gladde lyn te vorm.

Kom ons kyk na die funksie, f ( x ) = 2 x . Ons kan dan al die punte ( x ; y ) beskou wat so is dat y = f ( x ) , in hierdie geval y = 2 x . Byvoorbeeld ( 1 ; 2 ) , ( 2 , 5 ; 5 ) , en ( 3 ; 6 ) stel sulke punte voor en ( 3 ; 5 ) stel nie so 'n punt voor nie, aangesien 5 2 × 3 . Indien ons 'n kol op al die punte sit, asook al die soortgelyke punte vir alle moontlike waardes van x , sal ons die grafiek soos in [link] kry.

Grafiek van f ( x ) = 2 x

Die vorm van die grafiek is baie eenvoudig, dit is bloot ’n reguitlyn deur die middel van die vlak. Hierdie "stippingstegniek" is die sleutel tot die verstaan van funksies.

Ondersoek: teken van grafieke en die cartesiese vlak

Stip die volgende punte en trek 'n gladde lyn deur hulle: (-6; -8), (-2; 0), (2; 8), (6; 16).

Notasie vir funksies

Tot dus ver het ons gesien jy kan y = 2 x gebruik om 'n funksie voor te stel. Hierdie notasie raak verwarrend as jy met meer as een funksie werk. 'n Meer algemene manier om funksies neer te skryf, is deur die notasie f ( x ) , te gebruik, waar f die funksienaam en x die onafhanklike veranderlike is. Byvoorbeeld, f ( x ) = 2 x en g ( t ) = 2 t + 1 is twee verskillende funksies. Met f en g die name en x en t die veranderlikes. As mens van f ( x ) praat, sê mens “f van x”.

Questions & Answers

find the 15th term of the geometric sequince whose first is 18 and last term of 387
Jerwin Reply
I know this work
The given of f(x=x-2. then what is the value of this f(3) 5f(x+1)
virgelyn Reply
hmm well what is the answer
how do they get the third part x = (32)5/4
kinnecy Reply
can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
okay, so you have 6 raised to the power of 2. what is that part of your answer
I don't understand what the A with approx sign and the boxed x mean
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
I'm not sure why it wrote it the other way
I got X =-6
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
oops. ignore that.
so you not have an equal sign anywhere in the original equation?
is it a question of log
I rally confuse this number And equations too I need exactly help
But this is not salma it's Faiza live in lousvile Ky I garbage this so I am going collage with JCTC that the of the collage thank you my friends
Commplementary angles
Idrissa Reply
im all ears I need to learn
right! what he said ⤴⤴⤴
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
Kevin Reply
a perfect square v²+2v+_
Dearan Reply
kkk nice
Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
how do you translate this in Algebraic Expressions
linda Reply
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
anybody can imagine what will be happen after 100 years from now in nano tech world
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Got questions? Join the online conversation and get instant answers!
QuizOver.com Reply

Get the best Algebra and trigonometry course in your pocket!

Source:  OpenStax, Siyavula textbooks: wiskunde (graad 10) [caps]. OpenStax CNX. Aug 04, 2011 Download for free at http://cnx.org/content/col11328/1.4
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Siyavula textbooks: wiskunde (graad 10) [caps]' conversation and receive update notifications?