Question

stiind ca x supra y = 0,25 si x+y=25 calculati x+y supra y si determinati x si y

Answer 1

[tex]\it x+y = 25 \ \ \ \ (1) \\\;\\ \\\;\\ \dfrac{x}{y} =0,25 \Rightarrow \dfrac{x}{y} = \dfrac{1}{4} \Rightarrow \dfrac{x+y}{y} = \dfrac{1+4}{4} \Rightarrow \dfrac{x+y}{y} = \dfrac{5}{4} \ \ \ \ (2)[/tex]

[tex]\it \ Din\ (1),\ (2) \Longrightarrow \dfrac{25}{y} = \dfrac{5}{4} \Longrightarrow y=\dfrac{25\cdot4}{5} \Longrightarrow y = 20 \ \ \ \ (3) [/tex]


$\it \ Din \ (1), \ (3) \Longrightarrow x+20=25 \Longrightarrow x=5.$