Discuss the below:
Solve each system by graphing:
1) y=2x
y=-x+3
2) y=2x-1
2y=x-2
3) 3y-3x=9
x-y=1
4) y=x-5
2x - 5y=1
5) y=x+4
3y-5x=6
6) x-y=5
3y-5x= 6
7) x-y =5
2x=2y=14
8) 2x-y=4
2x=4x-6
Solve each system by addition method.
9) x+y=7
x-y=9
10) x-y=12
2x=y=3
11) -3x+5y=13
9x - 3y=5
12) 2x-2y=13
3x=4y= -15