Question

Use the given information to find the unknown value.

y varies directly as the cube of x . When x=2 , then y=7 . Find y when x=3 .

Answer 1

23.625

Explanation:

Y=K*X3

7=k*2 3

7=k*8

7/8=k*8/8

k=7/8=0.9

y=7/8*3 3

y=7/8*27

y=189/8

y=23.625