1. x-y=5 2x-y=7 2. 2x+2y=8 x+5y=6 3. 3x-y=5 x-y=2 4. 2x-y=3 x+y=1 5. x-y=3 x+2y=5

1) x=5+y....disubstitusi ke...
2(5+y)-y=7
10+2y-y=7
y= -3 maka x=5+(-3)
x =2

2)2x+2y=8....x+y=4
x=4-y substitusi ke...( 4-y)+5y=6
4y=2
y=1/2 maka x= 4 - 1/2
x= 7/2

3)x=y+2 disubstitusi ke...
3(y+2)-y=5
3y+6-y=5
2y= -1
y = -1/2 maka x= -1/2 + 2
x= 3/4