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

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

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 1 9 11 46 48 Race 2 9 5 8 41 1.) 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.

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

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) =

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)

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.

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

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

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

Homework