Odpowiedzi

2009-12-13T13:50:18+01:00
2x+9y=-9
-3x+3y=8/*3

2x+9y=-9
-9x+9y=24

11x=-33
2x+9y=-9

x=-3
2*(-3)+9y=-9

x=-3
9y=-9+6

x=3
9y=-3/÷9

x=-3
y=-⅓
3 4 3