Răspuns:
-2x+3y=11
7x+y= -4 l×(-3)
-21x-3y=12
-23× / =23
x=23/-23
x= -1
-2x +3y=11 si inlocuim pe x cu -1
-2×(-1)+3y=11
2 +3y=11
3y=11-2
3y=9
y=9÷3
y=3
7x+y=-4
y=-4-7x
-2x+3(-4-7x)=11
-2x-12-21x=11
-23x=11+12
x=23/(-23)
x=-1
y=-4-7×(-1)
