Rezolvați sistemele:
(2x-y+5 x-2y-7
x-2y-15 3x+y-10
+
-=1
=-2
3
4
5
2
b)
x-3y-5x+2y+2
+
x+3y-2 2x+y+7
=-1
2x+y+7=-2
2
3
4
3
c)
x+y-9 x+4y-7
4
x-y+5
+
3
3x-2y+3
2x-3y+6
x-4y-2
=
-6
=3
4
6
d)
=-2
+
x+3y-4 2x-3y-7=1
5
4
3
5
Exercițiul 27
