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y=ax+b
a+b =4 /*(-1)
3a+b =2
-a-b =-4
3a+b =2
2a =-2
a =-1
-1 +b =4
b =5
y =-x+5 - równanie prostej
y=ax+b
a+b =4 /*(-1)
3a+b =2
-a-b =-4
3a+b =2
2a =-2
a =-1
-1 +b =4
b =5
y =-x+5 - równanie prostej