Răspuns :
x/y=3/4=>y=4x/3
5x-2y=28
5x-2*4x/3=28
5x- 8x/3 = 28. - amplificam cu 3
15x - 8x = 84
7x= 84 => x = 12
5x-2y=28
5x-2*4x/3=28
5x- 8x/3 = 28. - amplificam cu 3
15x - 8x = 84
7x= 84 => x = 12