Odpowiedź :
x+2y=6
x-y=3
x+2y=6
x=3+y
3+y+2y=6
3+3y=6
3y=3
y=1
x=3+y
x=3+1
x=4
y=1
x=4
x-y=3
x+2y=6
x=3+y
3+y+2y=6
3+3y=6
3y=3
y=1
x=3+y
x=3+1
x=4
y=1
x=4
x+2y=6
x-y=3
x=6-2y
x-y=3
x=6-2y
6-2y-y=3
x=6-2y
-3y=-3 /:(-3)
x=6-2y
y=1
x=6-2*1
y=1
x=6-2
y=1
x=4
y=1
x-y=3
x=6-2y
x-y=3
x=6-2y
6-2y-y=3
x=6-2y
-3y=-3 /:(-3)
x=6-2y
y=1
x=6-2*1
y=1
x=6-2
y=1
x=4
y=1