Question

{15+2(x + 3y) = 3(4x + y),
{2(5x – y) – 3y = 2+3(2x – y) ​

Answer 1

$\left \{ {{15 + 2x + 6y = 12x + 3y} \atop {10x - 2y - 3y = 2 + 6x -3y}} \right.$

$\left \{ {{-10x + 3y = -15} \atop {4x - 2y = 2 | :2}} \right.$

$\left \{ {{-10x + 3y = -15} \atop {2x - y = 1}} \right.$

$\left \{ {{-10x + 3y = -15} \atop {y = 2x - 1}} \right.$

$\left \{ {{-10x + 3(2x - 1) = -15} \atop {y = 2x - 1}} \right.$

$\left \{ {{-10x + 6x - 3 = -15} \atop {y = 2x - 1}} \right.$

$\left \{ {{-4x = -12} \atop {y = 2x - 1}} \right.$

$\left \{ {{x = 3} \atop {y = 2 * 3 - 1}} \right.$

$\left \{ {{x = 3} \atop {y = 5}} \right.$