## Algebra 1: Common Core (15th Edition)

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.