### Home > CAAC > Chapter 4 > Lesson 4.2.4 > Problem 4-100

4-100.

What was Francis' starting point, or *b*?

What is the growth each month, or *m*?

Substitute these values into the equation *y* = *mx* + b.

Which variable represents the amount of money?

Substitute $1000 for this variable in your rule.

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