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m=-2
m1xm2=-1
-2xm2=-1
-2m2=-1
m2=-1/-2
m2=1/2
y-y1=m(x-x1)
y-5=1/2(x-2)
y-5=1/2x-1
y=1/2x-1+4
y=1/2x+3 x(-2)
-2y=-x-6
x-y+6=0