### Home > CCAA8 > Chapter 5 Unit 6 > Lesson CCA: 5.3.3 > Problem 5-122

5-122.

An arithmetic sequence has . Write an equation for the sequence. What is

*?*

The general equation for an arithmetic sequence is .

Use to write an equation.

Use

Solve the system of equations you wrote for and

*.*

To find , substitute

*in the equation that you wrote.*