Question

5x +2y = 40
-2x - 5y = 26​

Answer 1

¡Saludos de Brazil!

$\left \{ {{5x+2y=40} \atop {-2x-5y=26}} \right. \\\\\left \{ {{5x+2y=40~\cdot(5)} \atop {-2x-5y=26~\cdot (2)}} \right. \\\\\left \{ {{25x+10y=200} \atop {-4x-10y=52}} \right. \\\\21x=252\\\\x=\dfrac{252}{21} \\\\x=12$

- Substituindo el la primera equación:

$5x+2y=40\\5\cdot 12+2y=40\\60+2y=40\\2y=40-60\\2y=-20\\\\y=\dfrac{-20}{2} \\\\y=-10$

¡Espero haberte ayudado! =)