Let the other number be represented by y.
Now, since the sum of the two numbers is 44, we have that:
[tex]x+y=44[/tex]Now, we simply make y the subject of the relation by subtracting x from both sides of the equality sign, as follows:
[tex]\begin{gathered} x+y=44 \\ \Rightarrow x+y-x=44-x \end{gathered}[/tex][tex]\Rightarrow y=44-x[/tex]Therefore, the other number is given by:
[tex]44-x[/tex]