Răspuns :
2x-y=9 => y=2x-9
x+2y=2
inlocuim
x + 2× (2x-9) = 2
x + 4x - 18 = 2
5x = 20
x = 20: 5
x = 4
y = 2 × 4 -9
y = 8 - 9
y = -1
2x-y=9 => y=2x-9
x+2y=2
inlocuim
x + 2× (2x-9) = 2
x + 4x - 18 = 2
5x = 20
x = 20: 5
x = 4
y = 2 × 4 -9
y = 8 - 9
y = -1