1. Pre-Algebra Comparing and Scaling 2.3
Monday, September 8

2. Problem 2.2 ACE Questions #1 and #2 answers

3. What did we do last time 2.2
In investigation 2.2 we completed a table to pizza prices for Howdy and Royal Pizza What was the equation we came up with for Howdy’s pizza? How about for Royal Pizza?
Equation for Howdy’s Pizza: P=13n
Equation for Royal Pizza: P=12n
What does the 13 represent in the equation for Howdy’s pizza?
What does the 12 represent in the equation for Royal’s pizza?

4. Learning Target I will be able to identify a unit rate in
a description,
an equation
a table, or
a graph.

5. Vocabulary
Constant of proportionality: The constant ratio of two proportional quantities, x and y; usually written as y = kx, where k is the constant of proportionality. For example in the equation y= ¾ x, the constant or proportionality is ¾. The graph for this relationship is shown below.
Who can tell me the definition of a unit rate?

6. Problem 2.3 A

7. Problem 2.3 A Number of oranges (n) 10 5 1 20 11 13 Cost, C $2 $1 $.20$4
$2.20
$2.60

8. Problem 2.3 A Number of oranges (n) 10 5 1 20 11 13 Cost, C $2 $1 $.20$4
$2.20
$2.60

9. Problem 2.3 A
5a. Every time the cost of oranges goes up by $1, the number of oranges increases by 5.
5b. C = .20n, this equation says that every time the number of oranges goes up by 1, the cost goes up by $.20.
5c. $.20/1 orange and oranges/$1
5d. The constant of proportionality and the unit rate are the same.
Number of oranges (n) 10 5 1 20 11 13
Cost, C $2 $1
$.20 $4
$2.20
$2.60

10. Problem 2.3 B

11. Problem 2.3 B

12. Problem 2.3 B

13. Problem 2.3 C

14. Problem 2.3 C

15. Problem 2.3 C
4. Gus should buy the pasta at Fresh Foods, it is $.83/box.

16. Rate your understanding
I will be able to identify a unit rate in
a description,
an equation
a table, or
a graph.

17. Homework
ACE Questions P. 51 #9 and #10