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y varies directly as x and when x = 6 ,   y = 12.

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y varies directly as the square of x and when x = 4 ,   y = 80 . 

y = 5 x 2

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y varies directly as the square root of x and when x = 36 ,   y = 24.

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y varies directly as the cube of x and when x = 36 , y = 24.

y = 10 x 3

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y varies directly as the cube root of x and when x = 27 ,   y = 15.

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y varies directly as the fourth power of x and when x = 1 ,   y = 6.

y = 6 x 4

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y varies inversely as x and when x = 4 ,   y = 2.

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y varies inversely as the square of x and when x = 3 ,   y = 2.

y = 18 x 2

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y varies inversely as the cube of x and when x = 2 ,   y = 5.

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y varies inversely as the fourth power of x and when x = 3 ,   y = 1.

y = 81 x 4

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y varies inversely as the square root of x and when x = 25 ,   y = 3.

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y varies inversely as the cube root of x and when x = 64 ,   y = 5.

y = 20 x 3

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y varies jointly with x and z and when x = 2 and z = 3 ,   y = 36.

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y varies jointly as x ,   z ,   and   w and when x = 1 ,   z = 2 ,   w = 5 , then y = 100.

y = 10 x z w

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y varies jointly as the square of x and the square of z and when x = 3 and z = 4 , then y = 72.

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y varies jointly as x and the square root of z and when x = 2 and z = 25 , then y = 100.

y = 10 x z

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y varies jointly as the square of x the cube of z and the square root of W . When x = 1 , z = 2 ,  and  w = 36 ,  then  y = 48.

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y varies jointly as x   and   z and inversely as w . When x = 3 ,   z = 5 ,   and w = 6 , then y = 10.

y = 4 x z w

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y varies jointly as the square of x and the square root of z and inversely as the cube of w .  When x = 3 , z = 4 ,  and  w = 3 ,  then  y = 6.

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y varies jointly as x and z and inversely as the square root of w and the square of t  . When x = 3 , z = 1 , w = 25 ,  and  t = 2 ,  then  y = 6.

y = 40 x z w t 2

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Numeric

For the following exercises, use the given information to find the unknown value.

y varies directly as x . When x = 3 ,  then  y = 12.  Find  y  when  x = 20.

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y varies directly as the square of x . When x = 2 ,  then  y = 16.  Find  y  when  x = 8.

y = 256

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y varies directly as the cube of x . When x = 3 ,  then  y = 5.    Find  y  when  x = 4.

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y varies directly as the square root of x . When x = 16 ,  then  y = 4.  Find  y  when  x = 36.

y = 6

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y varies directly as the cube root of x . When x = 125 ,  then  y = 15.  Find  y  when  x = 1 , 000.

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y varies inversely with x . When x = 3 ,  then  y = 2.  Find  y  when  x = 1.

y = 6

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y varies inversely with the square of x . When x = 4 ,  then  y = 3.  Find  y  when  x = 2.

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y varies inversely with the cube of x . When x = 3 ,  then  y = 1.  Find  y  when  x = 1.

y = 27

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y varies inversely with the square root of x . When x = 64 , then y = 12. Find y when x = 36.

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y varies inversely with the cube root of x . When x = 27 , then y = 5. Find y when x = 125.

y = 3

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y varies jointly as x   and   z . When x = 4 and z = 2 , then y = 16. Find y when x = 3 and z = 3.

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y varies jointly as x ,   z ,   and   w . When x = 2 , z = 1 , and w = 12 , then y = 72. Find y when x = 1 , z = 2 , and w = 3.

y = 18

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y varies jointly as x and the square of z. When x = 2 and z = 4 , then y = 144. Find y when x = 4 and z = 5.

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y varies jointly as the square of x and the square root of z . When x = 2 and z = 9 , then y = 24. Find y when x = 3 and z = 25.

y = 90

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y varies jointly as x and z and inversely as w . When x = 5 , z = 2 ,   and   w = 20 , then y = 4. Find y when x = 3 and z = 8 ,   and   w = 48.

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y varies jointly as the square of x and the cube of z and inversely as the square root of w .  When x = 2 , z = 2 , and w = 64 , then y = 12. Find y when x = 1 , z = 3 , and   w = 4.

y = 81 2

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Practice Key Terms 7

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Source:  OpenStax, Precalculus. OpenStax CNX. Jan 19, 2016 Download for free at https://legacy.cnx.org/content/col11667/1.6
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