\"subtraction\"\"

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The equation is \"\"

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Apply subtraction property of inequality: Subtract 18 from each side.

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\"\"

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\"\"

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\"\"                                     (Additive inverse property: \"\")

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\"\"                                           (Additive  identity property : \"\")

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\"\"                                                    (Subtract: \"\") 

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Graph the solution set on a number line

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\"number

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Note: A circle means that this point is not included in the solution set. \"\"

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Check:

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To check, substitute21, a number and less than 22, in \"\".

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\"\"                                          (Substitute \"\")

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\"\"                                                   (Add : \"\")

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The inequlity is true\"\"

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The inequality solution is \"\".