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

Question

anonymous · Answer

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

anonymous · Answer

i really dont know

anonymous · Answer

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.

anonymous · Answer

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