Presupun că sunt sisteme…
x + 3y = 5
- x + y = 11
________ +
/ 4y = 16 => y = 4 => x = - 7
2x + 7y = 11 |•2
3x - 2y = - 6 |•7
4x + 14y = 22
21x - 14y = - 42
____________ +
25x / = -20 => x = - 20/25 = - 4/5
2 • (- 4/5) + 7y = 11
- 8/5 + 7y = 11
7y = 11 + 8/5
7y = 63/5
y = 63/5 • 1/7
y = 9/5
