Question

Aflati numerele x si y stiind ca sunt direct proportionale cu 4 si 5 iar produsul lor este 500

Answer 1

[tex] \frac{x}{4} = \frac{y}{5} =\ \textgreater \ 5x=4y =\ \textgreater \ x = \frac{4y}{5} [/tex]
x*y = 500
$\frac{4y}{5}* y = 500 =\ \textgreater \ 4y^{2} =2500 =\ \textgreater \ y^{2} = 625 =\ \textgreater$ y = 25 sau y = -25
x = $\frac{4y}{5} = \frac{4*25}{5} = 20$
sau
x = $\frac{4y}{5} = \frac{4* (-25)}{5} = -20$