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y=ax+b
4=a*0+b
0=-3*a+b
b=4
0=-3a+4
3a=4
a=4/3
y=4/3x+4
podstawiamy punkty A=(-3;0); B=(0;4)
a=4-0/0-(-3)=
a=4/3
y=ax+b podstawiamy punkt np.B=(0;4)
4=4/3*0+b
b=4
y=4/3x+4