These tables of ordered pairs represent some points on the graphs of lines P and R.
Line P
x y
-3 2
0 8
4 16
Line R
x y
-5 17
2 3
5 -3
Which system of equations is represented by lines P and R?
1. 3x-y=-12
7x+3y=21
2. 9x-4y=-9
2x+4y=15
3. 2x-y=-8
2x+y=7
4. x-2y=-8
6x+5y=30