Equations Unit 2

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EquationsUnit 2
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Equation

• Mathematical sentence with an equal sign.
• Contains variables, numbers, and/or symbols
• The sides of an equation are separated by an
  equal sign
• Example 5x-19x

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Open Sentence

• An equation that contains variables

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Domain

• A given set of numbers that are to be substituted
  in for the variable(s)

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Solution Set

• All solutions that make the equation true
• We use braces for set notation
• If not solution exists, we use or
• Known as the empty set

• All solutions that make the equation true
• We use braces for set notation
• If not solution exists, we use or
• Known as the empty set

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Example

• Solve 5x-19 if
• Read as x belongs to the set whose numbers are
  1, 2, and 3
• Steps used to solve this problem
• Create a table
• Plug in values for the variable(s)
• Simplify
• If it is true, it is a solution If it is false,
  not a solution

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