Question

Rezolvati sistemul (s1)(×+y=3
×-y=4.

Answer 1

Explicație pas cu pas:

$\left \{ {{x + y = 3} \atop {x - y = 4}} \right.$

$2x = 7 = > x = \frac{7}{2}$

$y = 3 - x = 3 - \frac{7}{2} \\ = > y = - \frac{1}{2}$