Question

If y varies directly as x, and y=6 when x=2, what is the value of y when x=7

Answer 1

21

Explanation:

y∞x

y=kx(where k is the constant)

6=2k

6/2=k

3=k

there the relationship between y,k and x is y=3x

y=3(7)

y=3×7

y=21