Answer
y=-x/12
Work Step by Step
$m=\frac{y_2-y_1}{x_2-x_1}$ (Pick 2 points on the line and use them to find the slope of the line)
$m=\frac{-150-(-50)}{1800-600}=-100/1200=-1/12$
y=mx+b (Use the slope and one of the chosen points to find the equation of the line)
-150=-(1800)/12+b
-150=-150+b
b=0
y=-x/12
