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3-74.

For the following equations, solve for . Be sure to check your answer, if possible. Show all work. Homework Help ✎

  1. Subtract from both sides.


    Get the variable on a side by itself.



    Solve for .

  1. Follow the steps in part (a).

    How does the negative sign in front of the parentheses change what is inside?

  1. Use a diagram of the Equation Mat or some other method to explain why .

    Refer to the Math Notes box in Lesson 2.1.9 if you need more help with using an Equation Mat.