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x1= 1 y1= 6
x2= 7 y2= 4
y-y1 x-x1
___ = ____
y2-y1 x2-x1
y-6 x-1
___ = ___
4-6 7-1
y-6 x-1
___ = ____ (perkalian silang )
-2 6
6(y-6)=-2(x-1)
6y-36=-2x+2
6y=-2x+2+36
6y= -2x+38
atau
-2x-6y+38=0
atau
2x+6y-38=0