Объяснение:
а)
{2х+3у=16
{4х-3у=14
+ ————
6х=30
х=30:6
х=5
2•5+3у=16
10+3у=16
3у=16-10
3у=6
у=6:3
у=2
(5;2)
б)
{х-2у=4 •(-2)
{2х+3у=18
{-2х+4у= -8
+————
7у=10
у=10/7
х-2•10/7=4
х-20/7=4
х=4+20/7
х=48/7
(48/7;10/7)
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Answers & Comments
Объяснение:
а)
{2х+3у=16
{4х-3у=14
+ ————
6х=30
х=30:6
х=5
2•5+3у=16
10+3у=16
3у=16-10
3у=6
у=6:3
у=2
(5;2)
б)
{х-2у=4 •(-2)
{2х+3у=18
{-2х+4у= -8
{2х+3у=18
+————
7у=10
у=10/7
х-2•10/7=4
х-20/7=4
х=4+20/7
х=48/7
(48/7;10/7)