Answer:
AC=10
Step-by-step explanation:
PC^2+6^2=10^2 (pyt theorem to find PC)
PC=8
PA=PB=6 (equal)
8^2+6^2=AC^2
AC=10
The most direct form to graph a line, is to find two points of it and connect them with a line.
Here we have:

Let's find the point where x = 0. To do this, we replace the x in the equation by 0:

We have our first point: (0, -6)
Next let's find the point where y = 0. Again, we replace y in by 0 in the equation:

We have our second point, (3, 0)
Now all we have to do is plot the points (0, -6) and (3, 0) in the plane, and connect them with a line, and then the line is graphed
The line should look like this:
(3a-7)^2
1. 9a^2-21a-21a+49
2. 3a(3a-7)-7(3a-7)
3. (3a-7)(3a-7)
4. Combine like terms
The question is not exhaustive.