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Week 18, Day One
Due Today- Scale Drawing of your Room
Week 17 TOC
HW #55- 4.2.1: 4-29 to 4-33
Warm Up
Simplify. Show each step the way
we have practiced in class.
A. 41+18 ¸ 3i2
B. -52 + 3( -2 - 7 )
Agenda
• Project/ TOC Collection
• Ch.4 Re-Cap
• Closer
Closer
Give a real life example of a
proportional relationship.
Project/TOC Collection
For those absent the last week before winter break,
please turn in:
• Your Scale Drawing project
• TOC from Week 17
Is the Relationship Proportional?
Carlos wants to buy some new video games. Each
game he buys costs him $36. Is the relationship
between the number of games Carlos buys and the
total price proportional?
Is the Relationship Proportional?
Carlos wants to buy some new video games. Each
game he buys costs him $36. Is the relationship
between the number of games Carlos buys and the
total price proportional?
Yes, this is proportional. The scale factor is 36.
Is the Relationship Proportional?
A single ticket to a concert costs $56, while buying
five tickets costs $250. Is the relationship between
the number of tickets bought and the total price
proportional?
Is the Relationship Proportional?
A single ticket to a concert costs $56, while buying
five tickets costs $250. Is the relationship between
the number of tickets bought and the total price
proportional?
No, this is not proportional.
1(56)=56 but 5(50)=250.
The scale factor is not the same for both pairs.
Is the Relationship Proportional?
Vu is four years older than his sister. Is the
relationship between Vu and his sister’s age
proportional?
Is the Relationship Proportional?
Vu is four years older than his sister. Is the
relationship between Vu and his sister’s age
proportional?
No, this is not proportional.
The relationship is to ADD 4. To be proportional, it
must be a relationship with multiplication.
Is the Relationship Proportional?
Janna runs at a steady pace of 7 minutes per mile. Is
the relationship between the number of miles she
ran and the distance she covered proportional?
Is the Relationship Proportional?
Janna runs at a steady pace of 7 minutes per mile. Is
the relationship between the number of miles she
ram and the distance she covered proportional?
Yes, this is proportional.
At 1 mile she ran for 7 minutes.
At 2 miles she ran for 14 minutes…
The scale factor is 7.
Is the Relationship Proportional?
Carl just bought a music player and plans to load 50
songs each week. Is the relationship between the
number of weeks after Carl bought the music player
and the number of songs on his player proportional?
Is the Relationship Proportional?
Carl just bought a music player and plans to load 50
songs each week. Is the relationship between the
number of weeks after Cal bought the music player
and the number of songs on his player proportional?
Yes, this is proportional.
At 1 week he will have 50 songs.
At 2 week he will have 100 songs…
The scale factor is 50.
Is the Relationship Proportional?
Anna has a new video game. It takes her five hours
of playing the game to master level one. After so
much time, Anna understands the game better and it
only takes her three hours of playing the game to
master level two. Is the number of hours played and
the game level proportional?
Is the Relationship Proportional?
Anna has a new video game. It takes her five hours
of playing the game to master level one. After so
much time, Anna understands the game better and it
only takes her three hours of playing the game to
master level two. Is the number of hours played and
the game level proportional?
No, this is not proportional.
5 hours for level 1
3 hours for level 2
The scale factor is changing.
Closer: Day 1
Give a real life example of a
proportional relationship.