### Home > CCA2 > Chapter 2 > Lesson 2.1.5 > Problem 2-72

2-72.

Find the equation of an exponential function that passes through each pair of points. *2-72a HW eTool* (Desmos) and *2-72b HW eTool* (Desmos). Homework Help ✎

and Use the equation

to help you here. Begin by substituting one of the points forand.Next, substitute the other ordered pair for

and.Use substitution, and solve for

.Now, solve for

.

and Look at the hints in part (a).

Use the eTool below to help you solve part (a).

Click the link at right for the full version of the eTool: *CCA2 2-72a HW eTool*

Use the eTool below to help you solve part (b).

Click the link at right for the full version of the eTool: *CCA2 2-72b HW eTool*