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y=2x+1
4x+y=13
y=2x+1
4x+2x+1=13
y=2x+1
6x+1=13 / -1
y=2x+1
6x=12 / 6
y=2x+1
x=2
y=2*2+1= 4+1=5
x=2
x=5
y=2
2) tutaj tez metoda podstawiania
5y-x=3
x=3-y
5y-(3-y)=3 zmiana znakow bo przed nawiasem mamy minus
x=3-y
5-3+y=3
x=3-y
2+y=3 /-2
x=3-y
y=1
x=3-1=2
x=2
y=1
4x+y=13
4x+ 2x+1=13
6x=12/:6
x=2
y= 2*2+1=5
5y-x=3
x=3-y
5y - (3-y)=3
5y-3+y=3
6y=6/:6
y=1
x=3-1=2
4x+y=13
4x+ 2x+1=13
6x=12/:6
x=2
y= 2*2+1=5
5y-x=3
x=3-y
5y - (3-y)=3
5y-3+y=3
6y=6/:6
y=1
x=3-1=2