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2x-3y=-1
-2x-4y=-6
2x -3y=-1
----------- +
-7y=-7
y=1
x+2=3
x=1
P=(1,1)
==============
Graficznie w zalaczniku:
y=-1/2x+3/2
x -1 0 1
y 2 3/2 1
y=2/3x +1/3
x 1 4
y 1 3