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x-1: 3-1=y-4:-6-4
x-1:2=y-4:12
x-12=2y-8(perkalian silang)
x-2y=-8-(-12)
x-2y=4
y-4 per -6-4 = X-1 per 3-1
Y-4 per -10 = X-1 per 2
dikali silang menjadi
2(Y-4) = -10( X-1 )
2y-8 = -10x +10
2y = -10x + 10 +8
2y + 10x = 18
y + 5x = 9