Question

If y varies directly as x^2 and y = 72 when x =3, what is the value of y when x = 6?

Answer 1

Answer:

288

Step-by-step explanation:

$y \alpha x {}^{2}$

then

$y = kx {}^{2}$

72=9k

dividing both side by 9

k=72÷9

=8

$y = 8 {x}^{2}$

y=8×6²

y=8×36

y=288