13. Rezolvaţi, prin metoda reducerii, sistemele:
(3x – y=3
(5x - 2y = 3
b)
3x + y =9
3x+5y = 6
2x+3y = 1
d)
e)
17.x - 3y = -8'
4x + 5y = 1)
x + 2y = -91
(3x - 5y = 13
(4x + 3y = -2
(4x - 3y = 17
(-5x + 4y = -22
f)​