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m=-2+4/0+5
m=2/5
m1.m2=-1
2/5.m2=-1
m2=-1.5/2
m=-5/2
y-y1=m(x-x1)
y-1=-5/2(x+2)
y=-5/2x-10/2+1
-------------------------kalikan 2
2y=-5x-10+2
2y=-5x-8