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y=ax+b
4=-a+b z tego b=4+a
2=3a+b
2= 3a + 4+a
2=4a+4
2-4=4a
-2=4a /:4
a=-1/2
b=4+(-1/2)=
b= 31/2
y=-1/2x+31/2- to jest równanie prostej