Question

If y is 2.5 when x ls 5 and y varies directly with x, find y when x is 10​

Answer 1

y = 5

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 = 2.5 when x = 5

k =
`(y)/(x)` =
`(2.5)/(5)` = 0.5

y = 0.5x ← equation of variation

When x = 10, then

y = 0.5 × 10 = 5