Odpowiedzi

2009-12-20T18:53:36+01:00
2x-y=4 //*2
x+2y=7

4x-2y=8
x+2y=7

5x=15 //:5
x=3

3+2y=7
2y=4
y=2

x=3, y=2

2009-12-20T18:54:16+01:00
2x-y=4
x+2y=7

x=7-2y

2*(7-2y)-y=4
14-4y-y=4
-5y=-10
y=2

x=7-2*2
x=3
Najlepsza Odpowiedź!
2009-12-20T18:54:31+01:00
2x-y=4
x+2y=7

2x-y=4 I*2
x+2y=7

4x-2y=8
x+2y=7
__________
5x=15
x=3

x+2y=7
x=3

2y=4
x=3

y=2
x=3