CPM Homework Help : AC Problem 4-84

In Spring, the daily high temperature in Boulder, Colorado rises about $\frac{1}{3}$ degree per day. On Friday, May 2, the temperature reached $74°$ . Predict when the temperature will reach $90°$ .

Hint:

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

More Help 1:

What is the growth rate?

More Help 2:

What is the starting point?

More Help 3:

What is the desired temperature?

Now, solve for $x$ .

$\frac{1}{3}x$

$\frac{1}{3}x + 74$

$\frac{1}{3}x+74\ =\ 90$

Answer:

$48$ days later
(Thursday, June 19).