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6x+4y=16 dan 6x-5y=-74
lalu substitusi...nanti ketemu jawabannya
3x+2y = 8 | 2 | 6x +4y = 16
6x -5y = -74 | 1 | 6x -5y = -74 -
9y = 90
y = 90/9
y = 10
subtitusi:
3x +2y = 8
3x +2.10 = 8
3x + 20 = 8
3x = 8 - 20
3x = -12
x = -12/3
x = -4
jadi hp = {-4,10}