Question

Daca x-y=9 iar x ori .y=10 Calculati x si y? Va rog ajutatima

Answer 1

[tex]x-y=9\Rightarrow x=y+9. \\ x\cdot y=10 \leftrightarrow (y+9)\cdot y=10\Rightarrow y^{2}+9y=10. \\ Cum~ y^{2}-pozitiv~\Rightarrow \boxed{y=1}~iar~\boxed{x=10.}[/tex]

Answer 2

x-y=9⇒x=9+y
x·y=10⇔(9+y)y=10⇔9y+y²=10⇒y=1⇒x=9+1=10