Ответ:
1064.1) -1;2.
1064.2)3;2
Объяснение:
1){7х+2у=-3
{-14х+3у=20;
{14х+4у=-6
{-14х+3у=20
7у=14
7х+2у=-3
у=2
7х+4=-3
7х=-7
х=-1
Ответ: -1;2.
2)3х+5у=19
7х-10у=1
6х+10у=38
13х=39
х=3
21-1=10у
Ответ:3;2.
[tex]\displaystyle\bf\\1)\\\\\left \{ {{7x+2y=-3} \ |\cdot 2\atop {-14x+3y=20}} \right. \\\\\\+\left \{ {{14x+4y=-6} \atop {-14x+3y=20}} \right. \\-----------\\7y=14\\\\y=2\\\\7x=-2y-3=-2\cdot 2-3=-4-3=-7\\\\x=-7:7=-1\\\\Otvet: \ (-1 \ ; \ 2)\\\\\\2)\\\\\left \{ {{3x+5y=19} \ |\cdot 2\atop {7x-10y=1}} \right. \\\\\\+\left \{ {{6x+10y=38} \atop {7x-10y=1}} \right. \\----------\\13x=39\\\\x=3\\\\5y=19-3x=19-3\cdot 3=19-9=10\\\\y=10:5=2\\\\Otvet: \ (3 \ ; \ 2)[/tex]
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Answers & Comments
Ответ:
1064.1) -1;2.
1064.2)3;2
Объяснение:
1){7х+2у=-3
{-14х+3у=20;
{14х+4у=-6
{-14х+3у=20
7у=14
7х+2у=-3
у=2
7х+4=-3
у=2
7х=-7
х=-1
у=2
Ответ: -1;2.
2)3х+5у=19
7х-10у=1
6х+10у=38
7х-10у=1
13х=39
7х-10у=1
х=3
21-1=10у
х=3
у=2
Ответ:3;2.
[tex]\displaystyle\bf\\1)\\\\\left \{ {{7x+2y=-3} \ |\cdot 2\atop {-14x+3y=20}} \right. \\\\\\+\left \{ {{14x+4y=-6} \atop {-14x+3y=20}} \right. \\-----------\\7y=14\\\\y=2\\\\7x=-2y-3=-2\cdot 2-3=-4-3=-7\\\\x=-7:7=-1\\\\Otvet: \ (-1 \ ; \ 2)\\\\\\2)\\\\\left \{ {{3x+5y=19} \ |\cdot 2\atop {7x-10y=1}} \right. \\\\\\+\left \{ {{6x+10y=38} \atop {7x-10y=1}} \right. \\----------\\13x=39\\\\x=3\\\\5y=19-3x=19-3\cdot 3=19-9=10\\\\y=10:5=2\\\\Otvet: \ (3 \ ; \ 2)[/tex]