### Home > AC > Chapter 4 > Lesson 4.2.2 > Problem 4-84

4-84.

In Spring, the daily high temperature in Boulder, Colorado rises about degree per day. On Friday, May 2, the temperature reached 74°. Predict when the temperature will reach 90°. Homework Help ✎

Using the equation *y* = *mx* + *b*, put the word problem into equation form.

What is the growth rate?

What is the starting point?

What is the desired temperature?

Now, solve for *x*.

48 days later

(Thursday, June 19).