Answer
y=-12x+80
Work Step by Step
Use two points (5,20)(6,8) and find the slope using $\frac{y2-y1}{x1-x2}$:
$\frac{20-8}{5-6}$=$\frac{12}{-1}$=-12
The slope is -12, using a given point and y=mx+b find b:
8=12(6)+b
8+72+b
b=80
Plug in m and b into the slope-intercept form: y=-12x+80.
