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2y=-x+1
y=-1/2x+1
y=2/1
(kalo tegak lurus m dikali -1, dan dibalik)
y-y1=m(x-x1)
y-1=2(x-(-2)
y-1=2(x+2)
y-1=2x+4
y=2x+4+1
y=2x+5