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m1=2
syarat tegak lurus:
m1 x m2=-1
2 x m2=-1
m2=-1:2
m2=-1 x1/2
m2=-1/2
y-y1=m2(x-x1)
y-4=-1/2(x-2)
y-4=-1/2x+1
y=-1/2+1+4
y=-1/2+5