Question

AYUDAAAAAAAAAA es para hoy​

Answer 1

Respuesta:

1.

Explicación paso a paso:

$x + y = 12\\2x - y = 15\\-----------------\\3x = 27\\x = \frac{27}{3} \\\\\X= 9$

x + y = 12

9 + y = 12

y = 12 -9

y = 3

2.

$x + 3y = 29\\2y - x = 11\\----------------\\5y = 40\\y = \frac{40}{5} \\\\y = 8\\\\\\2y - x = 11\\2 (8) - x = 11\\16 - x = 11\\- x = 11 - 16\\x = 5$

3.

$3x + 5y = 29\\(5) x - y = - 1\\ ---------------\\ 3x + 5y = 29\\\\5x - 5y = - 5\\------------\\8x = 24\\x = \frac{24}{8} \\x = 3\\\\3x + 5y = 29\\3(3) + 5y = 29\\9 + 5y = 29\\5y = 29 - 9\\y = \frac{20}{5} \\\\y = 4$