Odpowiedzi

2010-02-23T22:15:39+01:00
Y=5x
x+7=y
x+7=5x
4x=7
x=7/4
więc: y=x+7=7/4+7=7/4+28/4=35/4
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5x+4y=8 /-4y
5x=8-4y /:5
x=(8-4y):5
x=8/5-4/5y
2010-02-23T22:17:27+01:00