What you need to do is plot both lines. The point where they intersect is the solution.
Let me know if you're still having trouble then
just did the assignment--
A- 64
C- 8x3
F- 125x9
#1 - We're doing 3 * 3 * 3, so 3 * 3 is 9 and 9 * 3 is 27. So the answer you are looking for is C.) 27.
#2 - The answer is C.) 6/7. (Couldn't figure out a way to explain this sorry...)
Add the x values together, then divide by two. Do the exact same thing for the y values. Hope that helped.