1. 9/28/17 Combining Variable Expressions
DO NOW
Combining Unlike Terms: subtract the smaller from the larger term, use the sign from the larger term.
1) = 2) =
3) = 4) =
5) = 6) =

2. Think: 30 Seconds Write: 30 Seconds What is a variable?
Thought Question:
Think: 30 Seconds Write: 30 Seconds What is a variable? AP

3. What are we doing Today
OBJECTIVE: WE WILL be able to define, translate & combine variables & expressions WHY?: Variables are at the heart of math ESSENTIAL UNDERSTANDINGS: 1). A variable is a value we haven’t yet defined. 2). We can translate math into English. 3). Variable expressions can be combined and solved AP

4. Variables
Variables all have values; it is just unknown. A variable is an undefined value. You can use any letter to represent this variable. Most commonly we see X. Why did Malcom X use X as a last name? AP

5. Translating Expressions
An expression is a math phrase. Examples: 3 + 2, 9 x 8, 5X, N – 5 Expressions with a variable are called Variable Expressions. We will be translating these into English. Example: N + 5 = A number plus five. AP

6. Steps to translating expressions to English
1). A variable is usually translated as “a number” 2). Box the operation and translate that: plus, minus, times, divided by AP

7. Lets Do These Together
Translate the expressions:
1). 6x 2). B – 5
3). 6 ÷ Y 4). V + 10
5). 8N 6) ÷ X AP

8. Translating English into Expressions
1). Underline the operation vocabulary 2). “A Number” translates into a variable Examples: 7 times a number -> 7x A number split into 3 -> x/3 AP

9. Translate into expressions
1). A number minus 4 2). 12 times a number 3). Six added to a number 4). 19 divided by a number 5). A number cut into six 6). A number less five 7). Ten with a number added AP

10. Procedure for Combining Terms
Procedure for adding: 1). Draw a symbol under terms that can be combine. 2). Change all subtraction to addition by KFC Example: 8X + 15x + 4x 1). 4B + 4A + 6B - 2B 2) C – 2C C AP

11. Problem 1 : Combining
1). 2A + 4A AP

12. Problem 2
2). 5X + 10 – 3X X = AP

13. Problem 3 : Combining
3). 4G + G G – 2G = AP

14. Problem 4
4). 2 + XT+ 2XT - T = AP

15. Problem 5
5) Y+ 7XY = AP

16. Problem 6
6) X – 3X = AP

17. Problem 7
7) YX – 2Y YX= AP

18. Problem 8
8). 4 – XY + X X = AP