Question

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

Answer 1

@RedRum92 ,how would you represent "y varies directly as the square of x" mathematically ?

Answer 2

i really dont know

Answer 3

Ok. Let me help you with this:
\[y ∝ x^2\]
Therefore
\[y = kx^2\]
where k is a constant.

Now your duty is to find the constant k after substituting x = 1, y = 3.

Then after you get the value of k. substitute x = 3, the k value you get and then find your y value.

Answer 4

If you don't know, "∝" symbol means proportional to