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4x= 8-12
x=-1
-6+y-1= -4
y= 7-4 = 3
b. eliminasi
4x-5y=1........dikali2
-3x+2y=-6..........dikali5
shg
8x -10y=2
-15x+10y=-30 +
-7x=-28
x=4
(x=4) masuk ke pers 2 untuk menentukan y
-3y+2y=-6
-3(4)+2y=-6
2y=-6 +12=6
Y=3