Answer
$y=425-100x$
Work Step by Step
As the value of $x$ increases by $1$, the value of $y$ changes as follows:
$425, 325, 225, 125$
The differences are as follows:
$-100, -100, -100, -100$
Note, that when $x=0$, $y=425$, so $425$ is the base number to modify.
So we can write the following equation to represent the pattern:
$y=425-100x$
