exerciiitul astaaaaa

{x = −5+2y
{3x - 4y=-1
3(- 5 + 2y) - 4y = - 1
- 15 + 6y - 4y = - 1
2y = - 1 + 15 = 14
y = 7
{x = −5+2y
{3x - 4y = -1
x=-5+2*7=-5+14=9
x = 9