Week 3 09.25.17 Day 3 Writing a Linear Equation Part 1.notebook September 26, 2018

Do Now! Just a friendly • Have out practice worksheet reminder...You should find from yesterday (Slope,) IMN, your seat and start working pencil and calculator. on your Do Now! • TOC: immediately once you > pg. 41 Writing Equations enter this classroom! of Lines > p. 42 WEOL from a Graph

1 Week 3 09.25.17 Day 3 Writing a Linear Equation Part 1.notebook September 26, 2018

MGSE9­12.A.CED.1 Create equations and inequalities in one variable and use them to solve problems. Include equations arising from linear functions.

2 Week 3 09.25.17 Day 3 Writing a Linear Equation Part 1.notebook September 26, 2018

3 Week 3 09.25.17 Day 3 Writing a Linear Equation Part 1.notebook September 26, 2018

4 Week 3 09.25.17 Day 3 Writing a Linear Equation Part 1.notebook September 26, 2018

Ex: Slope is ‐1/2 and y‐intercept is ‐2

Ex: Points:(4,5) and (5,2) Ex: m = 1/2 and point (‐1,‐2)

5 Week 3 09.25.17 Day 3 Writing a Linear Equation Part 1.notebook September 26, 2018

Work Time:

1. Watch EDpuzzle, Writing Linear Equations Part 1 if you have not done so already. 2. Writing Linear Equations Practice 3. EDpuzzle assignment, Writing Linear Equations Part 2

6 Week 3 09.25.17 Day 3 Writing a Linear Equation Part 1.notebook September 26, 2018

Homework: • Complete "Writing Linear Equations Practice Worksheet" • Writing Linear Equations Part 2

7 Week 3 09.25.17 Day 3 Writing a Linear Equation Part 1.notebook September 26, 2018

Writing Linear Equations Part 1

8 Week 3 09.25.17 Day 3 Writing a Linear Equation Part 1.notebook September 26, 2018

We are going to write equations of lines given three different situations... • Given m and b. • Given m and a point. • Given two points.

9 Week 3 09.25.17 Day 3 Writing a Linear Equation Part 1.notebook September 26, 2018

Writing an equation of a line given m and b. 1. Write down y = mx + b. (Remember y = mx + b is Slope‐Intercept Form of a Line. ) 2. Substitute slope for m and the y‐intercept for b. 3. Simplify the equation.

Ex1) Slope is ­5 and Ex2) Slope is 1/3 y­intercept is 2. and y­intercept is 0.

10 Week 3 09.25.17 Day 3 Writing a Linear Equation Part 1.notebook September 26, 2018

Writing an equation of a line given m and a point. 1. Write down y = mx + b 2. Substitute slope in for m and the point in for (x,y). 3. Solve for b. 4. Substitute m and b back into the equation: y = mx + b.

Ex3) m = 2 and Ex4) m= undefined point (2,3) and point (3,6)

11 Week 3 09.25.17 Day 3 Writing a Linear Equation Part 1.notebook September 26, 2018

Writing an equation of a line given TWO points. 1. Write down y = mx + b. 2. Use the slope formula to find m. 3. Pick one of the ordered pairs and substitute slope in for m and the point in for (x,y). 4. Solve for b. 5. Substitute m and b back into the equation: y= mx + b.

Ex1) Points: (2,3) (Ex 2) Points: (6,­8) and (4,5) and (2,­8)

12 Week 3 09.25.17 Day 3 Writing a Linear Equation Part 1.notebook September 26, 2018

Write the equation of the line in slope intercept form given the following information. 1. Slope is ­1/2 and y­intercept is ­2

2. m = 1/2 and point (­1,­2)

3. Points:(4,5) and (5,2)

13 Week 3 09.25.17 Day 3 Writing a Linear Equation Part 1.notebook September 26, 2018

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