Question

Resolver por sustitución ​

Answer 1

Respuesta:

$x - \frac{y - 1}{2} = 0 \\ x = \frac{y - 1}{2}$

$\frac{x}{2} + \frac{y}{5} = 2 \\ \frac{5x + 2y}{10} = 2 \\ 5x + 2y = 2(10) \\ 5x + 2y = 20$

$5( \frac{y - 1}{2} ) + 2y = 20 \\ \frac{5y - 5}{2} + 2y = 20 \\ \frac{5y - 5 + 4y}{2} = 20 \\ \frac{9y - 5}{2} = 20 \\ 9y - 5 = 40 \\ 9y = 40 + 5 \\ 9y = 45 \\ y = 5$

$\frac{x}{2} + \frac{5}{5} = 2 \\ \frac{x}{2} + 1 = 2 \\ \frac{x}{2} = 2 - 1 \\ \frac{x}{2} = 1 \\ x = 1 \times 2 \\ x = 2$

RESPUESTA= A) {2,5}