Question

If y varies directly as x and y=8 when x=2, find x=6.

Answer 1

Explanation:

y varies directly as x

y ∞ x

y = kx

and y=8 when x=2

8 = 2(k)

8 = 2k

k = 8/2

k = 4

y = 4x

find y when x=6

y = 4(6)

y = 24

Answer 2

Explanation:

X=ky

2=8k

K=4

X=4y

6=4y

Y=1. 5