Odpowiedzi

2010-03-15T18:29:28+01:00
X+y=9
x-y=3

2x=12/2
x= 6

y=9-6
y=3
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2010-03-15T18:33:02+01:00
X+y=9
{x-y=3/x -1

x+y=9
-x+y=-3

2y=6/2

y=3
x+y=9

y=3
x+3=9

y=3
x=9-3

y=3
x=6





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