Răspuns:
a) 3x+2y=1 /x4
4x+3y=3 /x (-3)
_______________
12x+8y=4
-12x-9y=-9
___________
-y=-5
y=5
3x+10=1
3x=1-10
3x=-9
x=-3
5x+4y=-4 /x3
3x+5y=8 /x(-5)
_____________
15x+12y=-12
-15x-25y=-40
____________
-13y=-52
y=4
5x+16=-4
5x=-4-16
5x=-20
x=-4
Explicație pas cu pas:
