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m= -2/-5=2/5
m1.m2=-1
2/5.m2=-1
m2= -5/2
y-y1=m(x-x1)
y+1= -5/2(x+2)
y+1= -5/2x-5
y=-5/2x-5-1
y=-5/2x-6
atau
2y=-5x-12
atau
5/2x+y+6=0