NO Mtn math today. Quiz Clear your desk of everything. You only need a calculator.

Variables, Expressions, and Equations GLE Solve single-step linear equations and inequalities. Checks Use variables appropriately to represent numbers whose values are not yet known. Checks Solve single-step linear equations using inverse operations Evaluate an expression by substituting a number for the variable or variables in the problem. Objective: Understand and be able to solve expressions and equations.

What is a variable??? Discuss with a neighbor

These are variables These are not A = #, C = #, X = #,r = #, n = # = # A, C, n 3, 10, 75, 8, 12, 1, 0 Variable is…. A letter or symbol that represents an unknown number/amount. Examples: a, C, x, N,,

+-x  plus sum more than increased by total in all added to minus difference less than subtract decreased by Take away Subtracted from times product multiplied each of divided quotient divided by Other ways to show multiplication : 5 x 6 5(6) 5 · 6 Other ways to show division: 12 ÷ 6 12/6 Reading and Writing Algebraic Expressions 5

When we evaluate algebraic expressions, we are substituting a number in place of variable, then solving for an answer Evaluate each expression when a = 13 1)a + 3 2)17 – a 6

When we evaluate algebraic expressions, we are substituting a number in place of variable, then solving for an answer Evaluate each expression when a = 13 1)a ) 17 – a 17 –

You try to evaluate the following when d = 3 1) 25 – d 2) d + 21

You try to evaluate the following expression when d = 3 1)25 – d 25 – 3 25 – 3 = 22 2)d = 24

An Equation is a complete sentence that is either true or false = shows that each side has the same value examples: x + 7 = = 50 – = 14 y – 6 = = 14 10

Brainpop-Equations /equationswithvariables/ /equationswithvariables/

Next slides are 13 questions for review (around the room if you have time) Then, equations adding and subtracting. - WB page 233 #1-5 - Practice Workbook page HW- Worksheet #1

Determine if the following are expressions or equations: 1)7x 2)(6-3) – 1 = 2 3)14 = 7(2) 4)X + 9 = 13 5)12 – 5 13

6. Which algebraic expression represents the phrase: fifteen times a number, plus 3. A. 15(x – 3) B. 15(x) +15(3) C. 15x + 3 D x

7. Which expression represents the phrase: 7 more than a number, times 4? A. (7 – n) x 4 B. (n + 7) x 4 C n D. 4n + 7

8. Write the expression for n = – n A B C D Solve: If N = 2, then 2N = A. 4 B. 2 C. 3 D. 5

10. Alex scored 117 more points than Seth when they went bowling. The math expression n represents this sentence. What does "n" stand for in this math expression? A. Alex and Seth's score together B. Seth's score C. neither Alex's or Seth's score D. Alex's score

11. Megan and Karen each played 5 games. In those 5 Megan had g goals and Karen had 2 less than Megan. Write an algebraic expression for the number of goals Karen had at the end of the 5 games. A. g – 2 B. g + 2 C. g x 2

12. Your monthly internet bill is $43 plus $5.50 for each optional service. Which expression represents a bill including s optional services? A.$43 x $5.50 x s B.$43 + $5.50 x s C.$43 + $ s D.$43 x s + $5.50

13. The soccer field is 10 yards wider than the football field. Evaluate f + 10 for f = 50 yards to find out how long the soccer field is if the football field is 50 yards wide. A.80 yards B.70 yards C.60 yards D.50 yards

Determine if the following are expressions or equations: 1)7x 2)(6-3) – 1 = 2 3)14 = 7(2) 4)X + 9 = 13 5)12 – 5 1) expression 2) equation 3) equation 4) equation 5) expression How could you tell the difference between the two? 21

6.C 7.B 8.C 9.A 10.B 11.A 12.B 13.C

Equations GLE Solve single-step linear equations and inequalities. Checks Use variables appropriately to represent numbers whose values are not yet known. Checks Solve single-step linear equations using inverse operations. Objective: Understand and be able to solve equations using multiplication and division.

Tuesday npapp/learn/navigateIDP.do?method= vlo&internalId= – video 15-00http:// npapp/learn/navigateIDP.do?method= vlo&internalId= Textbook page 378 #1-6 together For practice: Workbook page 236 with a partner HW- worksheet #2 mult/div