Answer
$y=-4820x+297000$
Work Step by Step
First, find the slope.
$m=\frac{272900-297000}{5-0}=-4820$
We are given one ordered pair, (0,297000), so we know the y-intercept is 297000.
Now that we have the slope and the y-intercept, we can create a linear equation.
$y=mx+b$
$y=-4820x+297000$