Question

The value of y varies directly with x. If x=15, then y=9. Find the value of y if x=9

Answer 1

y = 3/5 x

Explanation:

Direct variation:

y = kx

We need to find k.

x = 15; y = 9

9 = k × 15

k = 9/15 = 3/5

Answer: y = 3/5 x