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3x -2y=-8 (2)
ubah persamaan 1
2x+4y=2 ÷2
x+2y=1
x=-2y+1(3)
masukkan persamaan3 ke pers 2
3 (-2y+1)-2y=-8
-6y+3-2y=-8
-8y=-11
y=11/8
2x+4y=2
2x+4 (11/8)=2
2x+11/2=2
2x=-11/2+2
4x=-9
x= -9/4