Предмет: Математика, автор: Mdapediki

дам 20 балов пожалуйста помогите очень срочно!!!
1){x+y=6
{5x-2y=9
2){2x+5=-7
{3x-y=15

Ответы

Автор ответа: farb50
0

Ответ:

1) х+у=6 х=6-у х=6-у

5х-2у=9 5•(6-у)-2у=9 30-5у-2у-9=0

х=6-у 21-7у=0 х=6-3=3

21-7у=0 -7у=-21

у=3

Ответ: (3;3).

2) 2х+5=-7 2х+5=-7 3•(-6)-у=15

3х-у=15 2х=-7-5 -18-у=15

2х=-12 -у=15+18

х=-6 -у=33

у=-33

Ответ: (-6;-33).

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