1. Lesson 7 Subtract Linear Expressions
Unit 3A Expressions
Lesson 7
Subtract Linear Expressions

2. Lesson 7: Subtract Linear Expressions
Objective: Swbat subtract linear expressions. Do Now: Worksheet

3. Lesson 7: Subtract Linear Expressions
The Iditarod is a dog sledding race in Alaska, over 1150 miles. The table shows two winning times. Days Hours Minutes Seconds Race Race ) What is the difference in hours, minutes and seconds between the two races? ____ hours ____ minutes ____seconds 2.) Explain how to find the differences in times between any two races, given the days, hours, minutes and seconds.

4. Lesson 7: Subtract Linear Expressions
Subtraction reverses the sign of each term in
the parentheses.
Example 1: (6x +3) – (2x +2)
6x + 3 – 2x – 2
4x + 1
Example 2: (2x – 3) – ( x – 2)
2x – 3 – x + 2
x – 1

5. Lesson 7: Subtract Linear Expressions
(5x – 9) – ( 2x – 7) =
2. (6x – 10 ) – ( 2x – 8) =
3. (-2x – 4) – (2x) =
4. (3x – 2) – ( 5x – 4) =
5. (4x – 4) – ( -2x + 2) =

6. Lesson 7: Subtract Linear Expressions
6. (6x + 5) – ( 3x + 1) =
7. (-4x – 7) – ( -5x – 2) =
(4x – 3) – ( 2x + 7) =
(5x – 4) – ( 2x + 3) =
(-6x – 11) – (-2x – 4)

7. Lesson 7: Subtract Linear Expressions
Real-World Problem
A hat store tracks the sale of college and professional team hats for m months. The number of college hats sold is (6m+3). The number of professional hats sold is (5m – 2).
Write an expression to show how many more college hats were sold than professional hats.
Evaluate if m equals 10.

8. Independent Practice #1 – 9 Problem Solving #1 - 6
Classwork
Guided Practice #1 – 4
Independent Practice #1 – 9
Problem Solving #1 - 6

9. Closure
Question: What property do you need to use when subtracting linear expressions. Exit Ticket Homework: Practice #1 - 19

10. Exit Ticket
Subtract.
(9x – 12) – (5x – 7)

11. Homework