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a1=a warunek równoleglości
y=2x-3
a=2
a1=2 A=(5 , -1)
2*5+b=-1
b=-1-10
b=-11
y=2x-11 równanie prostej równoleglej do zadanej, zawiera A
a= 2
a1= 2
y=a1x + b1
-1 = 2*5 +b1
-1 = 10 + b1
b1= -11
y= 2x -11