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4x - y = -16
2x+3y-6 = 0......2x + 3y = 6 ..kali 2...> 4x + 6y = 12
................................... 4x - y = -16 - (kurangi)
......7y = 28
y = 4
x = - 3
x + y = - 3 + 4 = 1
2x+3y-6 = 0 ......... persamaan ke 2
subtitusikan persamaan ke 1
-y = -4x-16
- (-y = -4x -16)
y= 4x+ 16 .............. persamaan ke 3
masukan pers ke 3 ke pers ke 2
2x+3y-6 =0
2x + 3(4x+16) - 6 =0
2x + 12x+48 -6 =0
14x +42 =0
14x = -42
x =-42/14
x = -3 ............. persamaan ke 4
masukan pers ke 4 ke pers ke 2
2x+3y-6 = 0
2(-3)+3y -6 =0
-6 +3y -6 =0
-12 +3y=0
3y= 12
y=12/3
y =4
X+Y = -3+4 = 1