1. Algebra Vocabulary SOL 6.23

2. Coefficient A coefficient is the numerical factor in a term. –Example: in the term 4x, 4 is the coefficient. If the coefficient is not written, it is 1 –Example: in the term d, 1 is the coefficient.

3. 1. Circle the coefficient 3x4y5a7ba1

4. A variable is a symbol (placeholder) used to represent an unknown number. –E–Example: in the term 4x, x is the variable Variable

5. 2. Circle the variable 3x4y5a7ba

6. Term A term is a number, variable, product or quotient in an expression of sums and/or differences. Terms are separated with a + or – sign. –Examples: w53w y / 8

7. How many terms are there? 7x 2 + 5x - 3 There are 3 terms!

8. 3. Indicate the number of terms in each expression 2x + 1_____ 3b_____ 5a - 25_____ a / 6 _____ y / 2 + 3 – 7_____ 4d – 6 _____ 2 2 2 1 1 3

9. Inverse operations are operations which undo each other. 4. Examples: Addition and _____________ are inverse operations Multiplication and _________ are inverse operations Inverse Operations Subtraction Division

10. Expressions An expression can be a term or a collection of terms separated by addition or subtraction signs. Expressions do not include an equal sign! Examples : 2x + 1 3y

11. Equations An equation is a mathematical sentence stating that two expressions are equal. –Example: The expressions are equal to one another. 2x + 14=

12. 5. Expression or Equation? A.4d – 6 B.3x = 6 C.3b D. a / 6 E. y / 2 + 3 = 7 Expression Expression Expression Equation Equation