### Home > AC > Chapter 5 > Lesson 5.2.1 > Problem 5-68

5-68.

Use the information in the problem to set up *y = mx + b* equations for both Frank and John.

Set the equations equal to each other and solve for *x*.

Substitute *x* back into one of the original equations and solve for *y*. Check that *x* and *y* work in both equations.

Define your variables.

*y* = total weight (lbs)*x* = time (weeks)*m* = weight growth each week (lbs/week)*b* = starting weight (lbs)

Use the eTool below to solve the problem by completing tables and graphing.

Click on the link at right for the full eTool version: AC 5-68 HW eTool