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y=ax+b
2=3a+b
2=a+b
b=2-3a
2=a+2-3a
2a=2-2
a=0 b=2-3*0=2
równanie; y= 2
b]
4=-a+b
-3=2a+b
b=4+a
-3=2a+4+a
3a=-3-4
a=-7/3 b=4-7/3=12/3-7/3=5/3
równanie;
y=-7/3x+5/3