Question

sistema de ecuación 2x-5y=7
7x+2y=2​

Answer 1

Respuesta:

$2x - 5y = 7(2) \\ 7x + 2y = 2(5) \\ 4x - 10y = 14 \\ 35x + 10y = 10 \\ 39x = 24 \\ x = \frac{24}{39} = \frac{8}{13}$

$2x - 5y = 7 \\ 2( \frac{8}{13}) - 5y = 7 \\ 16 - 65y = 13 \times 7 \\ - 65y = 91 - 16 \\ - 65y = 75 \\ y = \frac{75}{ - 65} = \frac{15}{13}$