The y-intercept is where the graph goes through the y-axis (the vertical line in the center). It goes through at y=-9, so the coordinates would be (0,-9), since it is (x,y).
If you substitute each ordered pair for x and y the only ordered pair that works is (0,-3) .
Answer:

Step-by-step explanation:
Given

Required
x for
the function is 
To do this, we set the numerator root 
So, we have:

Divide by 6

Solve for x

Also, we set the denominator greater than 0:

Divide by 3

Take square roots

So, we have:
and 
Combine both to give:

It is greater by 495.
Subtract 5 from 500 to get the answer.