Question

Rezolvati sistemul:
x+y=4
x-y=2

Answer 1

x=4-y => 4-y-y=2
4-2y=2
-2y=2-4
-2y=-2 *inmultim cu -1
2y=2
y=1
x+1=4
x=4-1
x=3

Answer 2

{x+y=4
{x-y=2
-------------
2x / =6 |:2
x=3
Acum ca l-am aflat pe x ,il inlocuim in prima ecuatie:
3+y=4
y=4-3
y=1
Deci x=3 ; y=1
Succes!