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m2=-1/m1
Potrzebne jest jescze rownanie peku prostych:
y-y1=m(x-x1)
Dane:
P(-1,3)
y=2x+1---->m1=2
m2=-1/2
podstawiam
y-3=-1/2(x+1)
y=-1/2x+5/2
ODP:y=-1/2x+5/2