Equations
Tables
Graphs
Proportional vs. Non-proportional
Unit Rates
100
What does the y stand for in the proportionality equation, y = kx?
The y variable.
100
Find the constant of proportionality.
k = 64/4 = 16
100
When does a graph show a proportional relationship?
When it's a straight line and passes through the origin.
100
What is one criteria for a graph to be proportional?
Linear or passes through the origin.
100
$936
200
What does k stand for in the proportionality equation, y = kx?
The constant of proportionality.
200
Find the amount of rainfall in 10 hours.
17.5*2=35
200
What is the cost for 1 movie ticket?
k = 60/5 = $12.00
200
When is a table proportional?
When all the x's and y's have the same k value.
200
$3.80
300
What is the constant of proportionality in this equation, y = 5x?
k = 5
300
*DOUBLE JEOPARDY*
Which table has a k value of 0.5?
table b
300
B.
k = y/x = 3/2 = 1.5
300
B.
300
8/3 or 2 2/3 mile in one hour
400
Write an equation to represent the amount of money Dannie earns if she sells beach towels for $12.50 each.
y = 12.50x
400
Does this table represent the number of y, months, per x, years?
No, there are 72 months in 6 years and 96 months in 8 years.
400
Does this graph represent the number of y minutes for x hours?
No, the graph says that 60 minutes is 1/2 hour or 120 minutes is 1 hour.
400
C. The relationship is not proportional.
400
183 calories
500
Write an equation to represent the cost of cherries if two pounds of cherries is $8.58.
y = 4.29x
500
Write an equation that represents the table below. 
y = 1/35 x
500
What does the ordered pair (4, 12) represent?
It takes 4 hours to make 12 dozen cupcakes.
500
Write an equation in the format y = kx.
y = 2.30x
500
*DOUBLE JEOPARDY*
The blue troop hikes 2/3 mile every 1/2 hour. The yellow troop hikes 3/4 mile every 1/3 hour. Which troop hikes faster?
Hint: find the unit rate for each troop first.
Hint: how do you compare fractions?