### Home > INT1 > Chapter Ch8 > Lesson 8.1.5 > Problem 8-74

This problem is the checkpoint for rewriting equations with more than one variable. It will be referred to as Checkpoint 8A. Homework Help ✎ Solve each equation for the indicated variable.

a. –3

*x*+ 5*y*= –10 (for*y*) b.*y*=*mx*+*b*(for*x*) c.*A*=*πr*^{2 }(for*r*^{2})Check your answers by referring to the Checkpoint 8A materials.

Ideally, at this point you are comfortable working with these types of problems and can solve them correctly. If you feel that you need more confidence when solving these types of problems, then review the Checkpoint 8A materials and try the practice problems provided. From this point on, you will be expected to do problems like these correctly and with confidence.

Answers and extra practice are located in the back of your printed textbook or in the Reference Tab of your eBook.

If you have an eBook for INT1, login and then click the following link: Checkpoint 8A Answers and Practice