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

Vocabulary Algebra A language of symbols Example 6-4b

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

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

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

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

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

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

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

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

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 8 - 3 P E MD AS Multiply 2(4) 5 Bring down - 3 Subtract 3 from 8 Answer: 5 3/4 Example 6-3a

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

MULTIPLE-CHOICE TEST ITEM Find the value of  A 24 B 36 C 48 D 144 6a + 4  3 Write expression 6(2) + 4  3 Replace a with 2 Follow Order of Operations Rules 12 + 12 P E MD AS Multiply 6(2) Bring down + Multiply 4  3 4/4 Example 6-4a

MULTIPLE-CHOICE TEST ITEM Find the value of A 24 B 36 C 48 D 144 6a + 4  3 Add 12 + 12 6(2) + 4  3 Choose the appropriate multiple choice answer 12 + 12 24 Answer: A 4/4 Example 6-4a

MULTIPLE-CHOICE TEST ITEM Find the value of the expression * MULTIPLE-CHOICE TEST ITEM Find the value of the expression A 11 B 15 C 21 D 47 Answer: B 4/4 Example 6-4b

Variables & Expressions Assignment Lesson 1:6 Variables & Expressions 12 - 46 Even End of Lesson 6