Writing Equations of Lines.notebook
August 17, 2016
Warm Up
Solve each equation.
1. -4x - 3 = 6x + 2
2. 8 = -2/3(2x - 6)
3. 5x - (6 -x) = 2(x - 7)
4.
Your total cost for a book, including 6% sales
tax, is $23.32. What was the price of the book
before the sales tax was added?
Warm Up
HW Answers
15. You ordered 7 t-shirts.
16. The salesperson sold $500,000 in cars to earn
$50,000 in one year.
17. Your friend bought 3 CDs and 7 DVDs.
18. After eight months, Andrew and Doug will have paid
the same amount for their TV services.
19. The length of the rectangle is 17 cm. and the width
is 12 cm.
20. The three consecutive odd integers are 153, 155,
and 157.
21. At 2 hours, the two parking options cost the same.
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Writing Equations of Lines.notebook
August 17, 2016
HOMEWORK #16
A salesperson at a car dealership has a base salary of
$25,000 per year and earns a 5% commission on total
sales. How much must the salesperson sell to earn
$50,000 in one year?
HW #16
HOMEWORK #17
Your friend bought a total of 10 CDs and DVDs as gifts
for $199. The price per CD was $15 and the price per
DVD was $22. Write and solve an equation to find how
many CDs and how many DVDs your friend bought.
HW #17
2
Writing Equations of Lines.notebook
August 17, 2016
Writing and Graphing Linear Equations
Slope formula:
Slope­intercept form:
Standard form:
Point­slope form:
Slope of a Horizontal line:
Equation of a Horizontal line:
Slope of a Vertical line:
Equation of a Vertical line:
Definitions
Writing Equations of Lines
You always need slope and one point to write the equation of a line, except for the equation of a vertical line.
Write an equation in slope­intercept form for the line that has the indicated slope and passes through the given point.
Example 1) m =3, (1, ­3)
Method 1: Point­slope form
Method 2: Slope­intercept form
Slope and One Point
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Writing Equations of Lines.notebook
August 17, 2016
Example 2) m = ­3/4, (2, 1)
Slope and One Point
Write an equation in slope­intercept form for the line containing the given points.
FIRST, find the slope. THEN, choose one of the two points to set up the equation.
Example:
3. (1, ­5) and (2, ­3) Given Two Points
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Writing Equations of Lines.notebook
August 17, 2016
Write the equation of the line that passes through the given points:
4. (2, 4) and (­4, 1)
5. x­intercept of ­2 and y­intercept of 2
Given Two Points
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Attachments
Practice 2.4 Writing Linear Equations 2.doc
Worksheet Write Linear Equations.doc
Alg 2 CP2 5th­6th Seating Chart.doc