Ответ:
x = 11; y = 7
Пошаговое объяснение:
[tex]\left \{ {{x + 4y = 39} \atop {2x - y = 15}} \right.\\\left \{ {{-2x - 8y = -78} \atop {2x - y = 15}} \right.\\-9y = -63\\y = 7\\x + 4 * 7 = 39\\x = 39 - 28 = 11[/tex]
(11; 7)
{х + 4у = 39
{2х - у = 15 | * 4
{8х - 4у = 60
{9х = 99
1)
9х = 99
х = 99 : 9
х = 11
2)
х + 4у = 39
11 + 4у = 39
4у = 39 - 11
4у = 28
у = 28 : 4
у = 7
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Answers & Comments
Ответ:
x = 11; y = 7
Пошаговое объяснение:
[tex]\left \{ {{x + 4y = 39} \atop {2x - y = 15}} \right.\\\left \{ {{-2x - 8y = -78} \atop {2x - y = 15}} \right.\\-9y = -63\\y = 7\\x + 4 * 7 = 39\\x = 39 - 28 = 11[/tex]
Ответ:
(11; 7)
Пошаговое объяснение:
{х + 4у = 39
{2х - у = 15 | * 4
{х + 4у = 39
{8х - 4у = 60
{9х = 99
{х + 4у = 39
1)
9х = 99
х = 99 : 9
х = 11
2)
х + 4у = 39
11 + 4у = 39
4у = 39 - 11
4у = 28
у = 28 : 4
у = 7