Question

_+_=10.5_-3.25=_find that unknown to match each equation

Answer 1

We have:

$\begin{gathered} x+y=10.5 \\ x-3.25=y \end{gathered}$

Then:

$\begin{gathered} x+(x-3.25)=10.5 \\ 2x-3.25=10.5 \\ 2x=10.5+3.25 \\ 2x=13.75 \\ x=\frac{13.75}{2} \\ x=6.875 \end{gathered}$$y=x-3.25=6.875-3.25=3.625$

The numbers are 6.875 and 3.625.