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Transparency 6

2. Splash Screen

3. Evaluate algebraic expressions
Objective
Evaluate algebraic expressions
Example 6-4b

4. Vocabulary Algebra A language of symbols
Example 6-4b

5. A symbol, usually a letter, used to represent a number
Vocabulary
Variable
A symbol, usually a letter, used to represent a number
X Y
(note: avoid using o, I, s because they look like numbers)
Example 6-4b

6. A combination of variables, numbers and at least one operation
Vocabulary
Algebraic expression
A combination of variables, numbers and at least one operation
2 + X
X – 4 3N
Example 6-4b

7. To find the numerical value of an expression
Vocabulary
Evaluate
To find the numerical value of an expression
Example 6-4b

8. Example 1 Evaluate Algebraic Expressions
Example 3 Evaluate an Algebraic Expression
Example 4 Evaluate an Algebraic Expression
Lesson 6 Contents

9. Evaluate 20 - c Write the expression 20 - 5 Replace c with 5. 15
Replace c with 5. 15
Subtract 5 from 20.
Answer: 15
1/4
Example 6-1a

10. Evaluate
Answer: 16
1/4
Example 6-1b

11. Evaluate p + q Write expression 14 + 13 Replace p with 14 27
Replace p with 14 27
Replace q with 13.
Add 14 and 13.
Answer: 27
2/4
Example 6-2a

12. Evaluate
Answer: 5
2/4
Example 6-2b

13. Follow Order of Operations Rules 8 - 3 P E MD AS Multiply 2(4) 5
Evaluate
2x - 3
Write expression
Replace x with 4
2(4) - 3
Follow Order of Operations Rules
P E MD AS
Multiply 2(4) 5
Bring down - 3
Subtract 3 from 8
Answer: 5
3/4
Example 6-3a

14. Evaluate
Answer: 25
3/4
Example 6-3b

15. MULTIPLE-CHOICE TEST ITEM Find the value of 
A B C D 144
6a  3
Write expression
6(2)  3
Replace a with 2
Follow Order of Operations Rules
P E MD AS
Multiply 6(2)
Bring down +
Multiply 4  3
4/4
Example 6-4a

16. MULTIPLE-CHOICE TEST ITEM Find the value of
A B C D 144
6a  3
Add
6(2)  3
Choose the appropriate multiple choice answer 24
Answer: A
4/4
Example 6-4a

17. MULTIPLE-CHOICE TEST ITEM Find the value of the expression*
MULTIPLE-CHOICE TEST ITEM Find the value of the expression
A B C D 47
Answer: B
4/4
Example 6-4b

18. Variables & Expressions
Assignment
Lesson 1:6
Variables & Expressions
Even
End of Lesson 6