Объяснение:
а)
{х-у=4
{2х+у=2
+ ———
3х=6
х=6:3
х=2
2-у=4
-у=4-2
-у=2
у= -2
(2; -2)
б)
{3х-5у=18 •2
{-2х+3у=11 •3
{6х-10у=36
{-6х+9у=33
+ —————
-у=69
у= -69
6х-10•(-69)=36
6х+690=36
6х=36-690
6х= -654
х= -654:6
х= -109
(-109; -69)
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Answers & Comments
Объяснение:
а)
{х-у=4
{2х+у=2
+ ———
3х=6
х=6:3
х=2
2-у=4
-у=4-2
-у=2
у= -2
(2; -2)
б)
{3х-5у=18 •2
{-2х+3у=11 •3
{6х-10у=36
{-6х+9у=33
+ —————
-у=69
у= -69
6х-10•(-69)=36
6х+690=36
6х=36-690
6х= -654
х= -654:6
х= -109
(-109; -69)