Ответ:
(48/7; 10/7)
Объяснение:
х-2у=4, |* -2 |*3
2х+3у=18; |*2
-2x+4y=-8, 3x-6y=12
2x+3y=18; 4x+6y=36
_____________________
7y=10 7x=48
y=10/7 x=48/7
х - 2у = 4 | * -2
2х + 3у = 18
-2х + 4у = -8
7у = 10
1)
у = 10 : 7
у = 10/7
у = 1. 3/7
2)
2х + 3*10/7 = 18
2х + 30/7 = 18
2х + 4. 2/7 = 18
2х = 18 - 4. 2/7
2х = 17. 7/7 - 4. 2/7
2х = 13. 5/7
2х = 96/7
х = 96/7 : 2
х = 96/7 * 1/2
х = 48/7 * 1/1
х = 48/7
х = 6. 6/7
Ответ: (6. 6/7; 1. 3/7)
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Answers & Comments
Ответ:
(48/7; 10/7)
Объяснение:
х-2у=4, |* -2 |*3
2х+3у=18; |*2
-2x+4y=-8, 3x-6y=12
2x+3y=18; 4x+6y=36
_____________________
7y=10 7x=48
y=10/7 x=48/7
Объяснение:
х - 2у = 4 | * -2
2х + 3у = 18
-2х + 4у = -8
2х + 3у = 18
7у = 10
2х + 3у = 18
1)
7у = 10
у = 10 : 7
у = 10/7
у = 1. 3/7
2)
2х + 3у = 18
2х + 3*10/7 = 18
2х + 30/7 = 18
2х + 4. 2/7 = 18
2х = 18 - 4. 2/7
2х = 17. 7/7 - 4. 2/7
2х = 13. 5/7
2х = 96/7
х = 96/7 : 2
х = 96/7 * 1/2
х = 48/7 * 1/1
х = 48/7
х = 6. 6/7
Ответ: (6. 6/7; 1. 3/7)