Question

Determinați soluțiile reale ale sistemului:
x+y=3
x-y=1

Answer 1

$\underline{\left \{ {{x+y=3} \atop {x-y=1}} \right. } \\ 2x=4 \ \ |:2 \\\\ \boxed{x=2} \\\\ y=3-x \\\\ y=3-2 \\\\ \boxed{y=1}$

Answer 2

x+y=3
x-y=1⇒2x=4⇒x=4/2⇒x=2
2+y=3⇒y=3-2⇒y=1
x=2
y=1
sucees