Răspuns:
Explicație pas cu pas:
1/2 x - y =0,5 | *2
x + 2/3 y = 1/2 |*6
----------------------
x -2y = 1
6x +4y = 3
-----------------
I. substitutie
x= 2y+1
6*(2y+1) +4y =3
12y +6+4y =3
16y = -3
y= -3/16
x= 2*(-3/16) +1
x= -6/16 +16/16
x= 10/18
x= 5/8
II. reducere
x -2y = 1 |*2
6x +4y = 3
-------------------
2x -4y =2
6x +4y =3
------------------
8x \ =5
x=5/8
5/8 -2y=1
-2y =1-5/8
-16y =8-5
-16y= 3
y= -3/16