Make copies of the grid for students. Students should know about ordered pairs and locating points on a grid. They should also be able to recognize and interpret an equation.
Today let's try finding the length of line segments in other locations on a grid.
Connect them with a horizontal line segment. Have a volunteer count the units using the grid squares or along the x-axis. Write the two x-coordinates on the board. So you can find the length of a horizontal line segment by subtracting the x-coordinates. Give students several horizontal line segments to graph, connect, and find the length of.