Question

daca 5a+4b=22 si 5a+b=19 sa se determine b

Answer 1

5a + 4b = 22 
 5a + b = 19 
---------------------------------
scazute   5a + 4b - 5a - b = 22 - 19 
3b = 3 
b = 3 :3 = 1

Answer 2

$5a+4b-5a-b=22-`19 \\ 3b=3=\ \textgreater \ b=3:3=\ \textgreater \ b=1$