### Home > A2C > Chapter 3 > Lesson 3.1.6 > Problem 3-81

3-81.

Find values of * *and

*that make each system of equations true (i.e., solve each system). Be sure to show your work or explain your thinking clearly.*

Remember that

.You can use this fact to make the first equation

, and then substitute for in the second equation.Solve for

.

Here are three possible methods for solving.

Since

, you can use substitution.

Then solve forand substitute to find .*or*Solve the first equation for

and substitute into the second equation. Then solve forand substitute to find.Since neither

norcan equal, divide the second by the first.