Definitions
What is a variable?
A symbol that represents an unknown value
Suveer buys stickers for 20 dollars. He buys each sticker for 4 dollars and buys a total of 5 stickers
Norman buys 14 stickers for a cost of 2 dollars every sticker
K is 2 dollars a sticker
What is a proportional relationship?
Two quantities that can vary and have a constant ratio between them
Jasmine buys teacher pens for a total of 17.95 and buys 4 pens total. She buys each pen for 4.40
Y is the total cost (17.95) and X is the number of pens (4)
K is 5 airplanes every hour
What is a constant of proportionality?
The constant ratio of one quantity to another
Mr. B travels 5 miles to school every day. He drives .7 miles every minute
Y is the total amount of miles (5) and X is the amount of minutes
Jeff shoots paper basketballs and shoots a total of 37 times. He shoots 4 times every 30 seconds
K is 4 shots every 30 seconds
What does "y" and "x" always stand for?
y is always total something and x is the number of individual items
Bryant plays a total of 4 hour of games. He plays each game for .6 hours
Y is the total amount of hours played (4) and X is the number of games played
Kaitlyn colors a different picture every 15 minutes. She colors a total of 13 pictures
K is 1 picture every 15 minutes
What is k?
K is my constant of proportionality
Y is the total number of serves (21) and X is the number of minutes
Mr. B grades a total of 51 papers every 17 minutes
K is 3 papers every minute