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=Y - y1/ y2 - y1 = X-x1/ x2-x1
=y-1/ -7 - 1 =X-2/-2 -2
=y-1/-8=x-2/-4
=4(y-1)=8(x-2)
=4y-4=8x-16
=4y=8x-16+4
4y=8x-12
y=2X-3
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