1. Moving Straight Ahead (MSA) On Desk:
Math CC7/8 – Be Prepared
Moving Straight Ahead (MSA)
On Desk:
Journal: Date: Title: MSA 2.3 Solution of an equation! Warm Up: Is this a linear relationship? If so, find the slope, y-intercept, and write the equation. If not, explain why it is not linear.
HW WS: Skill: Linear Relationships
TURN IN Monday!
Turn In: CS Test and cover sheet with signatures
In Your Planner:
HW: WS-MSA Skill Inv. 1, p. 86
Mon. Dec. 3rd:
CS Retake
Tues. Dec. 4th-MSA Quiz X Y -2 1 5 3 11 15

2. Warm-up: Is this a linear relationship? If so, find the slope,
y-intercept, and write the equation. If not, explain why it is not linear. X Y -2 1 5 3 11 15 X Y -2 1 5 3 11 15
Warm Up
Yes, this is a linear relationship.
As x goes up by 1, y goes up by 2. m = 2 b = 5 y = 2x +5

3. Tasks for Today
Warm Up
Lesson 2.3- Comparing Relationships
Begin HW?

7. Write this vocab in your journal!

8. Write these equations in your journal!!

9. Mighty
y = 49 + x or y = x + 49
b = $49 initial fee
m = $1 cost per shirt
No-Shrink
y = 4.5x or y = 4.5x + 0
b = $0 initial fee
m = $4.50 cost per shirt

10. Mighty
y = 49 + x or y = x + 49
x = 20
y = = $69
No-Shrink
y = 4.5 x or y = 4.5x + 0
x = 20
y = 4.5 x 20 = $90

11. Mighty
y = 49 + x or y = x + 49
y = 120
120 = 49 + x
120 – 49 = x
71 t-shirts = x
No-Shrink
y = 4.5 x or y = 4.5x + 0
y = 120
120 = 4.5x
120/4.5 = x
about 26 t-shirts = x

12. The break-even point or the point of intersection!
Make a Table!
If I need to buy more than 14 shirts, Mighty is the better deal.
If I need to buy less than 14 shirts, No-Shrink is the better deal.
# of shirts (x) 5 10 15 14
Mighty
Cost (y)
$49
$54
$59
$64
$63
No- Shrink $0
$22.50
$45
$67.50
What is the vocabulary word for when the costs are equal?
The break-even point or the point of intersection!

13. It is a linear relationship because each company is charging the same rate per t-shirt. Mighty charges $1 per shirt and No-Shrink charges $4.50 per shirt.
Mighty Tee: as n increases by 1, the cost increases by $1
No-Shrink Tee: as n increases by 1, the cost increases by $4.50

14. The cost per T-shirt for this company is $2.50.
The down payment , for no shirts, is $34.
This cost is less per T-shirt than No-Shrink, but greater than Mighty.
Yes, it is a linear relationship!
As the number of t-shirts increases by 1, the cost increases by $2.50.

15. Yes, (20, 84) lies on this graph.
If you extend the table to n = 20, then C = $84.
Or you can substitute the x and y into the equation!
The 20 means that if you buy 20 T-shirts it will cost $84.
You can substitute the coordinates into the equation to make a true statement.

16. C = n

17. Learning Check #2