Question

2x+2y= 14

x+2y=9 sustitución ​

Answer 1

Explicación paso a paso:

$x + 2y = 9 \\ x = 9 - 2y \\ \\ 2x + 2y = 14 \\ 2(9 - 2y) + 2y = 14 \\ 18 - 4y + 2y = 14 \\ 18 - 2y = 14 \\ - 2y = 14 - 18 \\ - 2y = - 4 \\ 2y = 4 \\ y = \frac{4}{2} = 2$

$x = 9 - 2y = 9 - 2 \times 2 \\ = 9 - 4 = 5 \\ x = 5$

$2x + 2y = 14 \\ 2 \times 5 + 2 \times 2 = 10 + 4 = 14 \\ x + 2y = 9 \\ 5 + 2 \times 2 = 5 + 4 = 9$

espero te sirva