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-y=-2x-4 /*(-1)
y=2x+4 postać kierunkowa
x=0 to
y=2*0+4 =4
A=(0 , 4)
y=0
to
2x+4=0
2x=-4
x=-4/2
x=-2
B=(-2 , 0)
lub
y=2x-4
..............