1. Warm-Up #9 (Tuesday, 9/22/15) 𝑦 2 + 4𝑦 2 +10𝑥𝑦−13𝑦𝑥
2) 10𝑦 2 + 4𝑦 2 +15𝑦−𝑥
3)−2 3𝑦 2 −2 𝑥 2 + 𝑦 2

2. Homework (Tuesday, 9/22)
Additional Practice worksheet for lesson and 2.03

3. Lesson 2.04 Simplifying Expressions

4. Example 1
− 𝑦 2 −5 𝑥 2 − 𝑥 2

5. Example 2
−2 𝑦 2 −5 𝑥 2 +𝑦− 10𝑥 2

6. Example 3
Simplify and evaluate the expression
2(4x+3)-1; x = 7

7. Example 4
Simplify and evaluate the expression
3x – 7x +y; x=1 and y=2

8. Example 5
The length and width of the rectangles are given below. Find an expression for the area and an expression for the perimeter. Length is 4x +2 Width is 3

9. Group Work:
A school needs to purchase desks and chairs. Each desk cost $12 and each chair cost $8. Write an algebraic expression to find the total cost if the school buys x desks and y chair.
Also answer the following questions:
1) Why are variables useful?
2) What do the variables represent in this problem?
3) The school wants to buy 100 desks and 80 chairs. How much would it cost the school?