Question

Stiind ca : xy+xz=280 si y+z=7, calculati-l pe x

Answer 1

$xy+xz=280 \Leftrightarrow x(y+z)=280 \Leftrightarrow x \cdot7=280 \Rightarrow \boxed{x=40}$

Answer 2

x[y+z]=280
⇒x=280/7
⇒x=40;