Question

Suma a 2 numere este 573.Daca primul numar se dubleaza,suma devine 782.Care sunt numerele?

Answer 1

$\left \{ {{a+b=573} \atop { 2a+b=782}} \right \ \ \ \hbox{Se scad cele 2 ecuatii} \\\\ a=782-573 \\\\ \boxed{a=209} \\\\ b=573-209 \\\\ \boxed{b=364}$

Answer 2

a=209
b= 364
a+b=573
2a+b=782
b=573-a
2a-a-209=0
2a-a=209
a+a-a=209
a=209
b=573-a
b=573-209
b=364
209+364=573
2X209+364=792