1. Subtracting Linear Expressions
September 11, 2018

2. Vocabulary
1) A variable is a symbol, commonly an alphabetic character or letter that represents a unknown number. (example: x)
2.) The coefficient is the numerical factor of a term that contains a variable. (example: 3x)
3.) A constant is a term with no variable. (example: 4)
4.) Like terms are terms that have the same variables and powers. (example: 3r and 5r)

3. Algebra Tiles
1 zero pair: -1
x x zero pair:

4. Model and simplify the following expression using Algebra Tiles.
Example 1: (3x – 2) – (x + 1) opposite flip tiles Zero pairs: Left: 2x - 3

5. Model and simplify the following expression using Algebra Tiles.
Example 2: (2x – 4) – (2x + 1) opposite flip tiles Zero pairs: Left: - 5

6. Model and simplify the following expression using Algebra Tiles.
Example 3: (x + 4) – (2x – 5) opposite flip tiles Zero pairs: Left: -x + 9

7. Model and simplify the following expression using Algebra Tiles.
Practice: 4.) (-x + 10) – (-4x + 2) 5.) (-2x – 5 ) – (x + 5) 6.) (-5x + 4) – (-3x + 6) 7.) (4x – 1) – (x – 7)

8. Model and simplify the following expression using Algebra Tiles.
Independent Practice (Exit Ticket) 8.) (-5x + 2) – (-x + 8) 9.) (3x – 8) – (4x – 9)