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x2-x1
m1=1-(-2)
-4-2
m1=3
-6
m1= -1/2
m2= 2(karena tegak lurus )
persamaan
y-y1=m2(x-x1)
y+2=2(x-2)
y+2= 2x-4
-2x+y+2+4=0
-2x+y+6=0