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4x-y = 4 (2) - (-3)
4x-y = 8+3
4x-y = 11
y=-4x+5
Syarat m1=m2
m2=-4
pers. garis melalui titik P(2,-3) dg m=-4
y-y1=m(x-x1)
y-(-3)=-4(x-2)
y+3=-4x+8
y=-4x+8-3
y=-4x+5
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