Bell Ringer

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Bell Ringer

• Seven plus two
• Seven less two
• The product of seven and two
• Twenty dollars less the price of a movie ticket
• A number less 4 is 12
• Twice a number is 18

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4-2 Solving Addition and Subtraction Equations

• KEY TERMS
• Inverse Operations undo each other (cancel
  each other out)
• Solve finding a number that makes the equation
  true

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Example 1

• SOLVE x 4 9
• x 4 9
• - 4 -4
• x 5
• ALWAYS CHECK YOUR ANSWER
• Substitute 5 for x in the problem
• 5 4 9

Subtract 4 from each side
Solution
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Your Turn

• y 6 9
• x 3 1
• -3 a 4

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Subtraction Property of Equality

• Subtract the same number from each side of an
  equation, the two sides remain equal
• x 2 3
• - 2 -2
• x 1
• SPE occurs in addition problems.

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Addition Property of Equality

• Add the same number from each side of an
  equation, the two sides remain equal
• x - 2 4
• 2 2
• x 6
• APE occurs in subtraction problems.

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Example 2

• Solve x 2 1. Check your solution.
• x 2 1
• 2 2
• x 3
• Check x 2 1
• 3 2 1
• 1 1

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Your Turn

• y 3 4
• r 4 -2
• -9 q - 8

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Example 3

• Tiger Woods won the 2002 Masters Championship
  with a final score of 12 under par, or -12. His
  scores for the first three rounds were -2, -3,
  and -6. What was his score for the fourth round?
• -2 (-3) (-6) s -12
• -11 s -12
• 11 s 11
• s -1

Write the equation
-2 (-3) (-6) -11
Add 11 to each side
Simplify
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Homework

• Page 158 159
• 4 36 even
• Show all Steps!