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A=(2 ,3) B=(4 ,1)
2a+b=3 /*(-1)
4a+b=1
-2a-b=-3
4a+b=1
------------ +
2a=-2
a=-2/2
a=-1
2*(-1)+b=3
-2+b=3
b=3+2
b=5
y=-x+5 równanie