### Home > CCA2 > Chapter 3 > Lesson 3.1.3 > Problem 3-48

3-48.

Find the formula for for the arithmetic sequence in which

*and*

*.*

Visualize the sequence as two points on a graph,

Finding the common difference is the same as finding

the constant rate of change of a line, the slope.

Use the slope or common difference and one of the points,

say . Then solve: