### Home > MC2 > Chapter 8 > Lesson 8.2.4 > Problem 8-66

8-66.

If is

*?*

**Justify**your answer in more than one way.

Write out equations to represent these phrases.

Solve for in the first equation:

Substitute in the second equation.

8-66.

If is

Write out equations to represent these phrases.

Solve for in the first equation:

Substitute in the second equation.