1. Aim: How do we write linear equations using two points? Do Now: Get a blue Algebra 1 Textbook. What is the slope and one point on the graph of *Assistance with the Do Now question can be found on p. 315 Date: Thursday, March 20, 2014

2. Why does Point Slope form work? Review Literal Equations - Solve for m Point Slope Form Divide both sides by (x-x 1 ) Slope Formula

3. Using Two Points to Write an Equation Textbook p. 317 Problem 3 What is the equation of the line at the right? Start with slope formula Use the given points to find the slope Use point-slope form Use either the given point for (x 1, y 1 ). For example you can use (1, 4)

4. Practice p. 318 # 16-18 Write an equation in point-slope form for each line.

5. 16. Write an equation in point-slope form for each line.

6. 17. Write an equation in point-slope form for each line.

7. 18. Write an equation in point-slope form for each line.

8. Graphing Using Point-Slope Form 1. Identify the slope and one point 2. Use slope to plot additional points 3. Sketch the graph y + 3 = 2(x -1)y + 5 = -(x + 2) **What is necessary for a good sketch?

9. Summary How can rewriting the equation in slope- intercept form be used as a check for the equation you wrote in point slope form?