The ordered pairs (20, -29.5), (21, -31), and (22, -32.5) are points on the graph of a linear equation.

Which of the following graphs show

Which of the following graphs show

**all**of the ordered pairs in the solution set of this linear equation?**Find the slope of the line going through two of the points and then match that slope with one of the graphs.**

y2 - y1

--------- = slope of a line

x2 - x1

(21, -31) , (22, -32.5) {two points}

-32.5 - (-31)

--------------- = slope {substituted into the slope formula}

22 - 21

-1.5

---- = slope {simplified}

1

-3

----- = slope {changed to a fraction}

2

Remember slope is rise over run. Looking for the line with a vertical change of -3 and a horizontal change of 2. In other words, find the line that goes down 3 for every 2 it goes to the right.

**A.)**

*- Algebra House*