Solving Simple Equations Part 2

1
Solving Simple Equations Part 2

• September 5, 2008
• Essential Question
• Arlene bought 6 notebooks for school. The total
  cost of the notebooks was 10.74 before tax. How
  much was each notebook?

2
Solving Equations

• A solution of a variable equation is a number
  that you can substitute for a variable to make
  the equation true.
• This means that you are finding all the answers
  for this problem!

3
Ways to solve equations!

• 1st Option
• Mental Math
• Some equations will be very easy to just look at
  and solve.

4
Examples of Mental Math

• 1. 48 6x
• 2. 24/w 3
• 3. 7p 63
• 4. d 5 40

5
Ways to solve equations!

• 2nd Option
• Inverse Operations
• Not all problems will be
• as easy to see the
• answers
• Fractions
• Decimals
• Negative s

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Inverse Operations

• What are inverse operations?
• They are mathematical operations that undo
• another operation
• Examples
• ? - x ?

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Steps to using inverse operations

• V 23
• - 6.1
• _____________
• V -140.3

• Find the number on the same side of the equal
  sign with your variable.
• Look at the sign in front of that number, and use
  the inverse operation on both sides of the equal
  sign.
• Simplify

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Examples of solving

• 9.6 2.4z

• X 16
• 4.5

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Word Problems

• In one week, Chris spent an average of 1.25 for
  1 cup of coffee. How much money did he spend on 7
  cups of coffee?