Question

$\left \{ {{x+y=5} \atop {3x-y=9}} \right.$ prin metoda reducerii

Answer 1

x+y=5
3x-y=9
Adunam cele doua ecuatii si obtinem:
4x=14
x=14/4=7/2
y=5-x=5-7/2=(10-7)/2=3/2
y=3/2