Question

rezolvati varog $\left \{ {{x+y=22} \atop {4x+2y=58}} \right.$PLZ

Answer 1

x+y=22
⇒x=22-y;
⇒4x+2y=58
⇒4[22-y]+2y=58
⇒88-4y+2y=58
⇒88-2y=58
⇒2y=88-58
⇒2y=30
⇒y=15;
⇒x=22-15
⇒x=7;

Answer 2

E un sistem de ecuatii si il poti rezolva prin doua metode, metoda substitutiei sau metoda reducerii.
{  x+y=22
  4x+2y=58|:2

{  x+y=22
   2x+y=29

{  x+y=22
   x=7

{  x=7
   y=15 deci S={7,15}