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(0,4) - punkt przeciecia z osia OY funkcji g(x)
f(x)= y = ax + b
y= ax + b (podstawiamy)
-2=-4a +b
4=b
-2=4a + 4
b=4
-4a=6
b=4
a=-1.5
b=4
odp. f(x) = -1.5x + 4