Ответ:
1)
х+4у=-6 х=-6-4у
3х-у=8
3(-6-4у)-у=8 х=-6-4*-2
-18-12у-у=8 х=-6+8
-13у=8+18 х=2
-13у=26 * - умножение
у=-2
2)
7х+3у=43
+ 11х=110 х=10 7х+3у=43 7*10+3у=43 70+3у=43
3у=43-70 3у=27 у=9
4х-3у=67
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Answers & Comments
Ответ:
1)
х+4у=-6 х=-6-4у
3х-у=8
3(-6-4у)-у=8 х=-6-4*-2
-18-12у-у=8 х=-6+8
-13у=8+18 х=2
-13у=26 * - умножение
у=-2
2)
7х+3у=43
+ 11х=110 х=10 7х+3у=43 7*10+3у=43 70+3у=43
3у=43-70 3у=27 у=9
4х-3у=67