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a=-1/2
y=ax+b postać kierunkowa
a1=a warunek rownoleglości
(-4 , 1)
-1/2 *(-4)+b=1
2+b=1
b=1-2
b=-1
g(x)=-1/2 x-1 prosta równolegla do zadanej , wawiera (-4 , 1)
1=(-1/2)*(-4)+b
1=2+b
b=1-2
b=-1
y=-1/2 x -1