Răspuns:
3)4x-3y=-7
2x+5y=29/(-2)
4x-3y=-7
-4x-10y=-58(+)
/ -13y=-65=>y=5
y=5
4x-15=-7
x=-8:4=>x=-2
Explicație pas cu pas:
4)1/4x-1/2y=3
2/10x+1/2y=-0,3(+)
1/4x+1/5x=2,7/ori 20
5x+4x=54=>9x=54
x=6
6/4-1/2y=3
3/2-1/2y=3/ori 2
3-y=6
y=3
