Question

plz put graph form
1) 2x - y = -13
y = x + 9
2)3x + 2y = 10
6x - y = 10
3)4x - 3y = 5
3x + 2y = -9
4)x + y = 7
x - y = -1

Answer 1

I'll do one of these. You can do the other three. You should always know what the answer is before beginning. 

Three is about as complicated as they get.
Multiply the top equation by 2 or 2(4x - 3y = 5) = 8x - 6y = 10
Multiply the bottom equation by 3 or 3(3x + 2y = - 9) = 9x + 6y  = - 27

8x - 6y = 10
9x + 6y = - 27 Now add these two
17x = - 17 Divide both sides by 17
x = - 1
You can solve for y
8(-1) - 6y = 10
-8 - 6y = 10 Add 9 to both sides.
-6y = 18
y = - 3

(-1,-3) is the point where this crosses.

What you want to see is here.