układ równań
y=2x+1
4x+y=13
4x+2x+1=13
6x=12 //6
x=2
y-2x=1
-y+2x=-1
6x=12
4·2 + y=13
8+y=13
y=5
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y=2x+1
4x+y=13
4x+2x+1=13
6x=12 //6
x=2
y=2x+1
4x+y=13
y-2x=1
4x+y=13
-y+2x=-1
4x+y=13
6x=12
x=2
4·2 + y=13
8+y=13
y=5