eliminasi dari 1.x+5y=-5 dan x+y=-5 2.3x+2y=12 dan 2x+3y=18

#1
x + 5y = -5
x + y = -5
-------------- -
4y = 0
y = 0
x = -5

#2
3x + 2y = 12
6x + 4y = 24

2x + 3y = 18
6x + 9y = 54

6x + 9y = 54
6x + 4y = 24
----------------- -
5y = 30
y = 6
x = 0