Lines - 1.1

1. Lines - 1.1

2. Goal • I will review different equations for lines, and find a linear regression equation on my calculator.

3. Reviewing Important Formulas • Slope • Ex: Find the slope between the points (4,-3) and (2,5). • Sol: m= -4

4. Different Equations for Lines • Point-Slope Form

5. Different Equations for Lines • Slope-Intercept m=slope b= y-intercept

6. Different Equations for Lines • General Form • where A and B • Ex: Graph • Put equation in slope intercept form.

7. More General Form • Example • Steps: • Find the general form of the equation between the points (-2,0) and (4,-5) • Find slope • Find y-intercept by plugging slope and one point into y=mx+b. 3. Multiply to get rid of fraction in front of x. 4. Get x and y on the same side of equation.

8. More General Form • Solution • -5x-6y = 10

9. Perpendicular lines • What do we know about the slopes of lines? • They are opposite reciprocals. • Ex:

10. Linear Regression • What is it? • Steps • Allows us to estimate a line of best fit for data using the calculator. 1. Stat. Enter. • Enter data into L1 and L2. • Stat. Calc. LinReg. Enter. • Vars. Y-Vars. Enter. Enter.

11. Linear Regression • Example • Let’s do number 46 on page 10 in your textbook.

12. Quizzy Poo

13. Homework • 1.1