Question

If y varies directly as x , and y = 6 when x = 15, find y when x = 25
.k = ______y = ______

Answer 1

3

y varies inversely as x

y = K / x , where K is any constant

y = 15 when x = 5

15 ( 5 ) = K = 75

y = 75 / x

When x = 25 ,

y = 75 / 25

y = 3

Answer 2

At x = 25, y equals to 10.4.