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funkcja liniowa ma postać:
y=ax+b
A=(x,y)=(2,-2)
B=(x,y)=(1,2)
-2=2a+b
2=a+b
-2=2a+b
a=2-b
a=2-b
-2=2*(2-b)+b
a=2-b
-2=4-2b+b
a=2-b
-2-4=-b
a=2-b
-6=-b
a=2-b
b=6
a=2-6
b=6
a=-4
b=6
y=-4x+6