### Home > CAAC > Chapter 4 > Lesson 4.2.2 > Problem 4-80

4-80.

What is the Science Club's starting point?

(*y*-intercept or *b*)

How much does their balance increase every week?

(growth rate or *m*)

Put this into equation (*y* = *mx + b*) format.

Follow the same steps to find an equation for the Math Club.

What are the *x*- and *y*-values of the point where the two lines intersect?

Use the eTool below to help you with this problem.

Click on the link at right for the full eTool version: AC 4-80 HW eTool