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musze podac wartosc ,,a" i,,b"
y=ax+b
uklad rownan
-1=2a+b
2=2a+b
b=2a-2
-1=2a+2a-2
-1=4a-2
-4a=-1/-4
a=1/4
2a=b-2
b=-1 i 1/2