Question

Ify is 2.5 when x is 5 and y varies directly with x, find y when x is 10.

5
7.5
12.5
20

Answer 1

Answer:A

Explanation:

Y varies directly as x

Y = kx

When y = 2.5, x = 5

Substitute the value of y and x

2.5 = k * 5

Make k the subject of the formula

k = 2.5/5

k = 1/2

:. The equation connectin y and x is

Y = 1/2x

When x = 10

Y = 1/2*10

Y = 10/2

Y = 5