Question

se tie ca x+y=23 si z=15 calculati xz+yz

Answer 1

xz+xy=z(x+y)=15(23)+ 15x23=345

Answer 2

$\displaystyle x+y=23 \\ z=15 \\ xz+yz=z(x+y)=15 \cdot 23=345 \\ \boxed{xz+yz=345}$