### Home > PC > Chapter 4 > Lesson 4.2.4 > Problem 4-118

4-118.

An exponential function passes through the points . Find an equation for the function.

Write the general equation for this problem.

Substitute the points in for

Subtract

Then divide one equation by the other.

Substitute the -value back into one of the original equations and solve for

*. Then substitute*

*and*

*into the general equation.*