1. 12/2/14 Warm up Evaluating Algebraic Expressions Large to small = multiply 1 ton (T) = 2,000 pounds  B. ¾ T = pounds (lb ) 

2. Large to small = multiply 1 ton (T) = 2,000 pounds  B. ¾ T = pounds (lb )  ¾ (T) = 1 (T)  X = 2,000 pounds . 75 2,000 = 1X  1,500 = 1X  1 1 1,500 pounds = X

3. Warm Up Please have out your homework! You will need journal and workbook.

5. Homework Check your understanding- Pg. 138

6. 12/2/2014 Evaluating Algebraic Expressions  VOCABULARY  VARIABLE – A variable is a letter or symbol used in place of unknown numbers or quantities in expressions and equations. For example, in the expression x + 5, x is the variable.  COEFFICIENT – A coefficient is a number that multiplies a variable. For example, 5 is the coefficient of 5x

7. 12/2/2014 Evaluating Algebraic Expressions  VOCABULARY  ALGEBRAIC EXPRESSION – An algebraic expression is a mathematical phase that uses numbers, variables, or both with operations. For example x + 5 or 5x.  TERM – A term is part of an expression containing a number, a variable, or both. Terms are separated in an expression by addition and subtraction symbols.  In the expression 2a + 3, there are two terms  The terms are 2a and 3

8. 12/2/2014 Evaluating Algebraic Expressions  MATH TIP  You cannot solve an expression. You evaluate it for a specific value by substituting that value for the variable and simplifying.  When evaluating an expression, use the order of operations. First, do the operations inside grouping symbols. Then evaluate expressions with exponents, Next, do multiplication and division from left to right. Finally, do addition and subtraction from left to right.

9. 12/2/2014 Evaluating Algebraic Expressions  1. Number of RidesTotal Cost of Rides 1$3.00 2$6.00 3$9.00 4$12.00 5$15.00 6$18.00 7$21.00

10. 12/2/2014 Evaluating Algebraic Expressions  2. The cost increases by $3.00 with each side.  3. $18.00  4. 8 3  5. 12 3

11. 12/2/2014 Evaluating Algebraic Expressions  6. 3r  7. The coefficient is 3, and the variable is r.  8. 36  Volunteer to go to the board: Try These C

12. 12/2/2014 Evaluating Algebraic Expressions  9. a. 8 + 3r  b. $26  10. a. 8 + 3r + 2g  b. $26

13. 12/2/2014 Evaluating Algebraic Expressions  11. 8, 3r, 2g

15. 12/2/2014 Evaluating Algebraic Expressions Check Your Understanding 12. a. 7x when x = 3 7, 21 b. 2b² + 4 when b = 5 2, 54 c. 80 – 5y when y = 9 – 5 (minus 5), 35