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7-28.

Given , simplify each of the following expressions.  

  1.  

    Rewrite the expression with a common denominator.

    Substitute with from the given equation.

    Simplify.

  1.  

    Rewrite the expression with a common denominator.
    Substitute from the given equation.

  1.  

    Rewrite the expression in the numerator with a common denominator.
    Simplify and substitute.

  1.  

    1. Multiply out.

    2. Make all fractions with the same common denominator.

    3. Simplify.