Question

Can someone help me with this problem please :)

Answer 1

y =
`(15)/(2)`

Explanation:

Given y varies directly with x then the equation relating them is

y = kx ← k is the constant of variation

To find k use the condition y = 10 when x = 20

k =
`(y)/(x)` =
`(10)/(20)` =
`(1)/(2)`

y =
`(1)/(2)` x ← equation of variation

When x = 15, then

y =
`(1)/(2)` × 15 =
`(15)/(2)`