Question

Suma y resta con comprobación;

c) -2x+9y = 16
6x-4y = 12

Answer 1

$\left \{ {{6(-2x+9y=16)} \atop {2(6x-4y=12)}} \right.$

$\left \{ {{-12x+54y=96} \atop {12x-8y=24}} \right.$

46y = 120 => y = 60/23

reemplazando...

-2x + 9y = 16

-2x + 9(60/23) = 16

-2x + 540/23 = 16

-46x + 540 = 368

-46x = -172 => x = 86/23