1. Today: 5.2 Assignment 5.2 Check Up 5.3 Instruction Break – tp Finish 5.3 Practice No trumpets sound when the important decisions of our life are made. Destiny is made known silently. Agnes DeMille Algebra 1

2. Assignment: 5.2 p282 #5-11, 13-35 odd, 42-45 MidTerm Progress Report Signature Goal Evaluation No trumpets sound when the important decisions of our life are made. Destiny is made known silently. Agnes DeMille Algebra 1

3. CHECK UP Write the equation of the lines in slope-intercept form. 5.2 5. You measure the depth of water puddle 3 hours after a storm was 2.25”. If an hour later the puddle is evaporating at a.25” per hour, find the equations that models the evaporation of this puddle.

4. Objectives: 1.Write linear equations given 2 points. 2.Use linear equations in real life. Vocabulary: none Writing Linear Equations Given Two Points 5.3

5. y = mx + b 5.2 How to find the Equation of a Line: 1.Find the slope (m) of the line. 2.Find the y-intercept (b) of the line. I.Plug m and a point into the equation II. 3.Plug these values into y = mx + b Writing Linear Equations Given Two Points

6. y = -5x + 11 Example 1 Writing an Equation of a Line Write the equation of the line that has the points (1,6) and (3,-4). Find the equations of the lines: through (-3,1) and (5,5) through (-10,-9) and (5,0) through (-3,4) and (-3,11)

7. Example 2 Writing an Equation of a Line from a Graph Write the equation of the line shown in the graph. 12 34567 1 2 3 5 6 4 7 -6 -2 -4 -6 -4-2

8. Example 3 Writing an Equation of Perpendicular Lines Write the equation of the line that is perpendicular to the line y = -3x – 2 and passes through the point (3, -4) Find the equations of the lines:

9. Example 4 Real Life Linear Models While moonlighting with CSI, you find an upper leg bone (femur) that belonged to an adult human male. The bone is 43 cm long. In humans, femur length is linearly related to height. To estimate the height of the person, you measure the femur and height of two colleagues. ≈ 169 cm Colleague #1: 40 cm femur, 162 cm height Colleague #2: 45 cm femur, 173 cm height

10. Example 4 Real Life Linear Models For science class, you need to know the Celsius equivalent of a normal room temperature of 70°F. You know that Celsius temperature is linearly related to Fahrenheit temperature. To estimate the Celsius equivalent, you use what you know about the Fahrenheit and Celsius temperature of the freezing and boiling point of water. Estimate the Celsius equivalent of normal room temperature. ≈ 21°C Freezing point: 32°F, 0°C Freezing point: 212°F, 100°C

11. Assignment: 5.3 p288 #3-19 odd, 21-35, 46, 47, 51, 52 MidTerm Progress Report Signature Goal Evaluation Quiz 5.1-3 Tomorrow No trumpets sound when the important decisions of our life are made. Destiny is made known silently. Agnes DeMille Algebra 1

12. Assignment: 5.3 p288 #19-37 odd, 46, 47, 51, 52 MidTerm Progress Report Signature Goal Evaluation Quiz 5.1-3 Tomorrow No trumpets sound when the important decisions of our life are made. Destiny is made known silently. Agnes DeMille Algebra 1

13. 1.textbook 2.pencil 3.binder w/dividers 4.paper 5.graph paper 6.calculator 7.colored pencils