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x1= 1 y1= 4
m2= -3
y-y1= m2(x-x1)
y-4= -3(x-1)
y-4= -3x+3
y= -3x+3+4
y= -3x+7
atau
3x+y-7=0
y-4=-3(x-1)
y-4=-3x+3
3x+Y-4-3=0
3x+y-7=0/y=-3x+7