Odpowiedź :
{3x - y = 9
{2x + y = 6
{y = -2x + 6
{3x - (-2x + 6) = 9
{y = -2x + 6
{3x + 2x - 6 = 9 / + 6
{y = -2x + 6
{5x = 15 / : 5
{x = 3
{y = -2 * 3 + 6
{x = 3
{y = 0
{3x - y = 9
{2x + y = 6
{y = -2x + 6
{3x - (-2x + 6) = 9
{y = -2x + 6
{3x + 2x - 6 = 9 / + 6
{y = -2x + 6
{5x = 15 / : 5
{x = 3
{y = -2 * 3 + 6
{x = 3
{y = 0