Question

The variable y varies directly as x. When x = 20, y = 12. What is the value of y when x = 15?

A. 7
B. 9
C. 18
D. 25

Answer 1

The value of y when x = 15 is 9

Variation

If the  variable y varies directly as x, this is expressed as;

y = kx

where k is the constant of proportionality

If x = 20 when y = 12, then;

k = y/x

k = 12/20

If x = 15, then the value of y is;

y = 12/20*15

y = 9

Hence the value of y when x = 15 is 9

Learn more on variation here: https://brainly.com/question/6499629

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