Question

$left { {{2x+3x=-7} atop {x-y=4}} right.$

Answer 1

{2x + 3x = -7
{ x - y = 4 |

{5x = -7
{3x - 3y = 12

{x = - 1,4
{x - y = 4

{x = -1,4
{y = -5,4