Răspuns:
a) {3x + 2y= 1 | × (-2)
{5x + 4y = -4
{-6x - 4y= -2
{ 5x + 4y= -4
~~~~~~~~~~~~~~~(+)~~~~~~
-x / = -6 | × (-1)
=> x= 6
inlocuim : 5x + 4y= -4
5×6 + 4y = -4
30 + 4y = -4
4y = -4 - 30
4y = -34
y= -34 : 4 = - 34/ 4 = - 17/ 2
y= - 17
2
b) 2x + 3y = -2 | × (-1)
4x + 3y = 3
-2x - 3y = 2
4x + 3y = 3
2x / = 5
x = 5
2
inlocuim : 4x + 3y = 3
4×5 + 3y = 3
2
10 + 3y = 3
3y = 3-10
3y = -7
y = - 7
3
