Algebra I: Lesson Plan * 8/28/2006

• Quickstart Sunshine State Standards Support Book p.1 #1 - 6
  Variables in Algebra
  MA.B.1.4.2, MA.B.2.4.2, MA.D.2.4.2
  
• Lesson
  (2-1) Solving One-step Equations
  
  1. Solving equations using multiplication and division
     Examples 4, 5, 6 similar to textbook
     
  2. Critical Thinking: p.79 #74, 75
     Peer Buddies
  3. Geometry Integration
     p.79 #78. Given that a triangle is isosceles AND the measurement of one of its base angles, solve for the variable used to describe the other base angle.
     5x = 70, divide by 5 on each side, x = 14
     
  (2-2) Solving two-step Equations
  
  1. Example 1
     Solve 13 = y/3 + 5
     What has been done to y? Divided by 3, add 5. Undo each of these steps in reverse order. Subtract 5, multiply by 3.
     13 - 5 = y/3 +5 - 5
     8 = y/3
     3(8) = 3 (y/3)
     24 = y
  2. Real-World Problem Solving
     Example: You order iris bulbs from a catalog. Iris bulbs cost $0.90 each. The shipping charge is $2.50. If you have $18.50 to spend, how many iris bulbs can you order?
     Solution: Define a variable. b = number of iris bulbs
     Write an equation $18.50 = $0.90b + $2.50 [you only get charged the shipping fee once]
     b has been multiplied by 0.90 and then added to 2.50.
     To solve subtract 2.50, divide by 0.90
     18.50 - 2.50 = 0.90b + 2.50 - 2.50
     16 = 0.90b
     16/0.9 = 0.9b/0.9
     17.777... = b
     Do not have enough money for 18 bulbs, so you will purchase 17 bulbs.
     
  
  
• Homework
  p.77 - 80 #21 - 51 x 3's, 63, 66, 77, 79
  p.84 - 86 # 1 - 35 x 3's, 40 - 51 x 3's, 56, 67