Question

Doua numere sint direct proportionale cu 5 si 2.Aflati cele doua numere,stiind ca suma lor este 147.

Answer 1

{ x , y } => {5,2 } x+y =147 x /5 = 2/y = k x = 5 k y =2 k 5k +2k = 7 k 7k = 147 k = 21 x = 5 * 21 = 105 y = 2 * 21 = 42 x+y = 147 105 + 42 = 147

Answer 2

(x, y) dp (5,7)⇒ x/5=y/2⇒2x=5y⇒x=5y/2

x+y=147⇒5y/2+y=147⇒5y+2y=294⇒y=294:7⇒y=42

x+y=147⇒x=147-y⇔x=105