Odpowiedź :
x+y=5
2x+y=3
x=5-y
2(5-y)+y=3
x=5-y
10-2y+y=3
x=5-y
10-y=3/-10
x=5-y
-y=-7
y=7
x=5-7
y=7
x=-2
2x+y=3
x=5-y
2(5-y)+y=3
x=5-y
10-2y+y=3
x=5-y
10-y=3/-10
x=5-y
-y=-7
y=7
x=5-7
y=7
x=-2