Question

Suppose y varies directly as x, and y = 9 when x = 36. Find y when x= 100.​

Answer 1

25

Explanation:

let x = 36

y = 9

x2 = 100

y2 = y2

y : x :: y2 : x2

We know,

Product of means = Product of extremes

That is,

y(x2) = x(y2)

Substituting the values,

9(100) = 36(y2)

=> 36(y2) = 900

=> y2 = 900/36

=> y2 = 25

so when x = 100, y =25