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3x+5y=50-10
2x+2y=20 |*3
3x+5y=40 |*(-2)
6x+6y=60
-6x-10y=-80
-4y=-20
y=5
2x+2y=20
2x+10=20 |-10
2x=10
x=5
3x+5y=50-10
2x+2y=20 |*3
3x+5y=40 |*(-2)
6x+6y=60
-6x-10y=-80
__________________
-4y=-20
y=5
_______________
obliczasz x
2x+2y=20
2x+10=20 |-10
____________
2x=10
x=5
y=5
x=5