### Home > AC > Chapter 13 > Lesson 13.RE3-S > Problem 2-153

2-153.

Find the formula for for the arithmetic sequence in which

*and*

*.*

Visualize the sequences 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 . And solve: