Answer
$25-x$
Work Step by Step
You are told that the sum of two numbers (which we will call $x$ and $y$) is 25.
Therefore, $x+y=25$.
To isolate $y$ and determine its value in terms of $x$, you need to subtract $x$ from both sides.
($x+y$)$-x=25-x$
Therefore, $y=25-x$.
