Решите системы уравнений методом подстановки:
1.
{ 2x - y = 3
{ 3x + y = -4
2.
{ x - 7y = 23
{ 3x - y = 14
1.
{ 2x - y = 3
{ 3x + y = -4
2.
{ x - 7y = 23
{ 3x - y = 14
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Answers & Comments
Ответ:
1. x = -0.2; y = -3.4
2. x = 3.75; y = -2.75
Объяснение:
1. 2x - y = 3, y = 2x - 3
3x + y = 3x + 2x - 3 = 5x - 3 = -4, 5x = -1, x = -0.2, y = 2 * -0.2 - 3 = -3.4
2. x - 7y = 23, x = 23 + 7y
3x - y = 3(23+7y) - y = 69+21y - y = 69 + 20y = 14, 20y = -55, y = -2.75, x=23+7*-2.75=3.75