Question

Exercitiul 6. Va rog frumos!!!

Answer 1

$\frac{a}{b} = \frac{2}{5}$
$a-b=-21$
$5*a=2*b$
$a= \frac{2b}{5}$
$\frac{2b}{5} -b=-21$
$\frac{2b-5b}{5} =-21$
$-3b=-21*5$
$-3b=-105$
$b= \frac{105}{3} =35$
$a= \frac{2b}{5}$
$a= \frac{2*35}{5} = \frac{70}{5} =14$
$a*b=14*35=490$