1 / 17

Transparency 3

Transparency 3. Click the mouse button or press the Space Bar to display the answers. Splash Screen. Example 3-3c. Objective. Solve subtraction equations. Example 3-3c. Vocabulary. None. Lesson 3 Contents. Example 1 Solve an Equation by Adding Example 2 Solve a Subtraction Equation

kin
Download Presentation

Transparency 3

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Transparency 3 Click the mouse button or press the Space Bar to display the answers.

  2. Splash Screen

  3. Example 3-3c Objective Solve subtraction equations

  4. Example 3-3c Vocabulary None

  5. Lesson 3 Contents Example 1Solve an Equation by Adding Example 2Solve a Subtraction Equation Example 3Use an Equation to Solve a Problem

  6. Example 3-1a Write the equation. Ask “what is being done to the variable?” The variable is being subtracted by 5 x – 5 + 5 = 10 + 5 Do the inverse on each side to “undo” the subtraction Bring down x - 5 Add 5 Bring down = 10 Add 5 1/3

  7. Example 3-1a Bring down x Combine “like” terms Bring down = Combine “like” terms x – 5 + 5 = 10 + 5 Use the Identity Property of Addition to add x + 0 x + 0 = 15 Answer: x = 15 1/3

  8. Example 3-1c Answer: w = 12 1/3

  9. Example 3-2a Write the equation. Ask “what is being done to the variable?” The variable is being subtracted by 5 = -1 + 5 x – 5 + 5 Do the inverse on each side to “undo” the subtraction Bring down x - 5 Add 5 Bring down = -1 Add 5 2/3

  10. Example 3-2a Bring down x Combine “like” terms Bring down = Combine “like” terms = -1 + 5 x – 5 + 5 Use the Identity Property of Addition to add x + 0 x 4 + 0 = Answer: x = 4 2/3

  11. Example 3-2b Answer: d = 3 2/3

  12. Example 3-3a The difference between the record high and the record low temperatures in Oregon is 173F. The record low temperature is –54F. What is the record high temperature in degrees Fahrenheit? Determine process to use Difference = high - low = x 173 The word “difference” tells us we need to subtract Replace “difference” with 173 Bring down = Replace “high” with variable 3/3

  13. Example 3-3a The difference between the record high and the record low temperatures in Oregon is 173F. The record low temperature is –54F. What is the record high temperature in degrees Fahrenheit? Difference = high - low Bring down - = x - (- 54) Replace “low” with -54 173 Remember: With 2 negative signs, put them together to make addition 173 = x + 54 3/3

  14. Example 3-3a Ask “what is being done to the variable?” Difference = high - low The variable is being added by 54 173 = x - (- 54) 173 = x + 54 Do the inverse on each side to “undo” the addition 173 - 54 - 54 = x + 54 Bring down 173 Subtract 54 Bring down = x + 54 Subtract 54 3/3

  15. Example 3-3a Combine “like” terms Difference = high - low Bring down = x 173 = x - (- 54) Combine “like” terms 173 = x + 54 Use the Identity Property of Addition to add x + 0 173 - 54 - 54 = x + 54 Add dimensional analysis 119 = x + 0 What is the record high temperature in degrees Fahrenheit? Answer: 119 = x 0 F 3/3

  16. Example 3-3c * The difference between the age of Julie’s mother and Julie’s age is 27 years. Julie’s age is 6. What is the age of Julie’s mother? Answer: x = 33 years NOTE: Could also be 33 years = x 3/3

  17. End of Lesson 3 Assignment

More Related