1. Review Solve for r; d = rt
Write the equation 2x – y = 9, so that y is a function of x.

2. 3.8 Rates, Ratios, and Percents

3. Notes Rate of a per b: represented as a/b.
Unit rate: rater per one given unit.
Ex: miles per hour

4. Examples Find unit rates
$2 for 5 cans of vegetables.
$2.39 for 10 apples

5. Examples Find unit rate
32 ounces for 4 servings
$67.50 for 3 concert tickets
14 cups of flour for 4 loaves of bread
144 bottles in 12 cartons.

6. Find the average speed Fly 780 miles in 2hrs Walk 1.2 miles in ¼ hour
Swim 3km in 40 min.
Drive 1440 miles in 3 days
Read 115 pages in 2.5 hours.
Mow 6 acres in 4 hours.

7. Word Problems
A concert sold out in 6hrs. A total of tickets were sold for the concert. At what rate did the tickets sell?
It took 86 hours for joe to cross the Atlantic in his balloon at a distance of miles. What was his average speed?

8. Word Problem
The record snow fall in a 24-hour period is 76 inches. At what rate did the snow fall on that day?
You received a $9 tip from a customer whose bill was $56. What percent did you receive for a tip?

9. Wrap up Questions/Comments
Hw: Text pg. 183, #’s: 2,5,6,8-21all, evens, 44-46