Question

If y varies directly as x, and y = 6 when x= 3, find y when x = 9.
y =
when x= 9.

Answer 1

$\frac{6}{3} = \frac{y}{9}$

$3y = 6 \times 9$

$3y = 54$

$y = \frac{54}{3} = 18$