Question

atunci valoarea lui y este...

Answer 1

3x+11y = 7
4(3x+11y) = 4*7
12x+44y = 28

4x-2y = 26
3(4x-2y) = 3*26
12x-6y = 78

12x+44y - (12x-6y) = 28-78
12x+44y-12x+6y = -50
44y+6y = -50
50y = -50
y = -1

2y=-2
4x = 26+(-2) = 24
x = 6