What is the equation of a proportional relationship?
y = kx
10
What formula can we use to find the constant of proportionality (K)?
k = y/x
15
How many tablespoons of honey are needed for 20 cups of flour?
16
15
What is the scale factor from picture A to picture B?
2
20
What is the scale factor from picture B to picture A?
1/4 or 0.25
20
What is the length of x if the scale factor is 4?
14 inches
15
What is the length of x if the scale factor is 1/2?
3 1/4 or 3.25
20
Does the table represent a proportional relationship? If yes, what is the constant of proportionality?
1/3
15
Does the table represent a proportional relationship? If yes, what is the constant of proportionality?
No.
15
Is this the graph of a proportional relationship?
No.
10
Is this the graph of a proportional relationship?
Yes.
10
One pound of bananas cost $0.59. How much will 25 pounds cost?
$14.75
15
A pair of pants cost $60.80 and was on sale for 1/4 off the original price. What is the sales price?
$45.60
20
A store bought a black jacket and marked it up by 2/3 of the original price. Then, it sold it for $250. How much was the jacket's original cost before the mark up?
$150
25
Area of rectangle A is 8 square inches and the scale factor is 2. What is the area of rectangle B?
32 square inches.
25
A pair of earrings cost $75. It is on sale for 1/3 off the original price. What is the discount?