(3; - 1)
Объяснение:
{6х - 5у = 23,
{2х - 7у = 13; l•(-3)
{6х - 5у = 23,
{-6x + 21y = - 39;
{6х - 5у = 23,
{6x - 5y -6x + 21y = 23 - 39;
{6х - 5у = 23,
{16y = - 16;
{6х - 5у = 23,
{y = - 1
{6х - 5•(-1) = 23,
{y = - 1;
{6х + 5 = 23,
{y = - 1;
{6х = 23 - 5,
{y = - 1;
{6х = 18,
{y = - 1;
{x = 3,
{y = - 1;
(3; - 1)
