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wspolczynnik kierunkowy prostej PQ
-4a+b=3
-2a+b=5
----------- _
-2a=-2
a=1
a1*a2=-1
a=-1
S=(x,y)
x=1/2*(-4-2)=-3
y=1/2*(3+5)=4
S=(-3,4)
y=-x+b
-(-3)+b=4
3+b=4
b=1
Odp. y=-x+1