1. Sharpened pencil and notebook paper
“Retro Wednesday” - Linear Representations, Part 2 Solving Systems with SUBSTITUTION
YOU NEED:
Your Textbook
Your homework
Sharpened pencil and notebook paper
BE IN YOUR SEAT AND READY BY 10:50 !!!

2. Retro Wednesday Refresh Warm-Up/Bellwork
A linear function is a function that has a straight line graph.
We can represent linear functions using an equation, a set of ordered pairs, a table or a graph.

3. savings = $250 he now has + $50 per month
Manuel is saving money for college. He already has $250. He plans to save another $50 per month.
Write a function to represent the situation:
savings = $250 he now has + $50 per month
s = m

4. Manuel is saving money for college. He already has $250
Manuel is saving money for college. He already has $250. He plans to save another $50 per month.
Now make a function table to find his total savings after 2, 4, 6, 8 and 10 months m m s 2
(2)
350 4
(4)
450 6
(6)
550 8
(8)
650 10
(10)
750

5. What are the ordered pairs for this function? m m s 2
(2)
350 4
(4)
450 6
(6)
550 8
(8)
650 10
(10)
750
What are the ordered pairs for this function?
(2, 350), (4, 450), (6, 550), (8, 650), (10, 750)

6. Graph the function using the ordered pairs: (2, 350), (4, 450), (6, 550), (8, 650), (10, 750)

7. Discrete or continuous
Discrete or continuous? Remember continuous data can take on any value so there is no space between the data values for a given domain. Discrete data have space between possible data values.
IF the domain of a function is integers, then it is a DISCRETE function. Examples: the number of glasses on a shelf, the number of chips in a bag.
IF the domain of a function is real numbers (fractions, decimals) then it is a CONTINUOUS function. Examples: the number of ounces in a glass, the weight in grams of each chip
Manuel’s situation is DISCRETE because we can’t compute his savings for a part of the month.

8. YOUR TURN . . . Each member of a health club receives two free guest passes.
Write a function to represent the situation.
Make a function table to show the number of guest passes given out to 10, 20, 30, and 40 members.
Graph the function . Is the function discrete or continuous?

9. Write a function to represent the situation
Write a function to represent the situation. Make a function table to show the number of guest passes given out to 10, 20, 30, and 40 members. Graph the function . Is the function discrete or continuous?
y = 2x where y represents total number of guest passes and x represents the number of members x 2x y 10
2(10) 20
2(20) 40 30
2(30) 60
2(40) 80