Question

Y is a directly proportional to x and y= 15 when x =6. Find x when y =40.

Answer 1

x = 16 when y = 40

Explanation:

as y is directly proportional to x:

y = x

y = k x .........k is here constant.

15 = k * 6

k = 15/6

k = 5/2

Here constant, k is (5/2)

So when y = 40

y = k x

40 = (5/2)x

x = 40(2/5)

x = 16