Answer:
If you want someone to give a good answer, you'll need to give a lot more detail than this, explain the question more.
X= -5
y= -2
I didn't double check the answers by inputting them back into the equations, but if you want to then you can. Yet I am 99% positive my answer is correct.
F(X) = X + 13
F(9) = (9) + 13
F(9) = 22.
A^2+b^2=c^2
8^2+6^2=c^2
64+36=c^2
100=c^2
C=10