Question

y varies directly as the square of x. When x = 1, y = 3. What is the value of y when x = 3?
1
9
27
81

Answer 1

Pretty sure its 9. Not sure 100% though

Answer 2

Your uncertainity is well warranted.

Answer 3

Is it 1 then?

Answer 4

\[y=kx ^{2}\]. First step solve for k which is the constant of proportionality.

Answer 5

Use the example given: 3=k(1^2) solve for k.

Answer 6

Oh I see. I didn't see the "as the square of x"

Answer 7

yes, 3=k1 or simply k=3. Now that you know k, solve for y=3(3^2)