Question

Rezolvati in multimea numerelor reale prin metoda reducerii sistemului de ecuatii.urgent va rog
$\left \{ {{4x-y=-1} \atop {2x+y=13}} \right.$

Answer 1

4x-y=-1=>y=4x+1
2x+y=13=>2x+4x+1=13=>6x+1=13=>6x=13-1=>6x=12=>x=12/6=>x=2
y=4*2+1=8+1=9