Practice Problems
You wanted to buy the best deal of chips at the store an 8 oz bag costs $2.50 and a 16 oz bag costs $4.00. Which one is the better deal PER OUNCE.
The 16 oz bag costs $0.25 per ounce while the 8 oz bag costs $0.31 per ounce so the 16 oz bag is a better deal.
Jenifer buys 4 tires for $272.
What is the cost of 1 tire?
$68
What is the constant of proportionality in the equation 4x = 8y?
the constant of proportionality is 2
What is the constant of proportionality in the equation y=2/3x?
2/3 is the constant of proportionality.
What is the equation for the constant of proportionality?
y=kx
Vivi is a drummer for a band. She burns 756 calories while drumming for 3 hours. She burns the same number of calories per hour.
How many calories does Vivi burn per hour?
252 calories
What is the constant of proportionality in the equation y=7x?
7 is the constant of proportionality.
What is our lesson today about?
Solving for unknowns and rates
What is the constant of proportionality in the equation y=28x?
28
A box of 15 cookies costs $9.
What is the cost for 1 cookie?
$0.60
Which equation has a constant of proportionality equal to 10?
A. 10y = 10x
B. 3y = 30x
C. 10y = 2x
D. y = 15x
B. 3y = 30x
DAILY DOUBLE!!!
Louis bought a set of 20 markers for $6.
What is the cost of 1 marker?
$0.30
Which equation has a constant of proportionality equal to 1/5?
A. 10y= 2x
B. 3y = 30x
C. y = 15x
D. 10y= 10x
A. 10y= 2x
Delilah does 184 jumping jacks in 4 minutes. She does her jumping jacks at a constant rate.
How many jumping jacks can Delilah do per minute?
46 jumping jacks
What is the constant of proportionality in the equation y=2.5x?
2.5 is the constant of proportionality.
A baker decorates 42 cupcakes in 30 minutes. She does this at a constant rate. How many cupcakes can the baker decorate per minute?
1.4 cupcakes.
Rachel types 162 words in 3 minutes. Rachel types at a constant rate.How many words does Rachel type per minute?
Rachel types 54 words per minute.
If you spend 70 dollars on 8 movie tickets, how much does one movie ticket cost?
$8.75 per movie ticket
What is the constant of proportionality in the equation 6y = 3x?
1/2 is the constant of proportionality.
Peter bought 8 lemons $6. What was the cost for 1 lemon?
$0.75