Answer
$y=11000x+19000$
Work Step by Step
First, find the slope.
$m=-\frac{66000-30000}{4-1}=\frac{33000}{3}=11000$
Now, substitute the slope and an ordered pair into y=mx+b.
$30000=11000+b$
$19000=b$
$y=11000x+19000$
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