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

Use (1,8.50) and (3,25.50) and plug into m=$\frac{y2-y1}{x2-x1}$ Thus, m=$\frac{25.50-8.50}{3-1}$=$\frac{17.00}{2}$=8.50. The slope is 8.50. Use one of the points and the slope and plug into y=mx+b: 8.5=8.5(1)+b 8.5=8.5+b 0=b Use m and b to plug into y=mx+b to get y=8.5x.