y varies directly as x. If y=20 when x=4, find the constant of proportionality.
k=4
k=1/4
k=1/5
k=5
2. Multiple Choice
1 minute
1 pt
What kind of equation is this? xy=8
Linear Equation
Direct Variation
Inverse Variation
Joint Variation
3. Multiple Choice
5 minutes
1 pt
If y = 15 when x = 12 find y when x = 32.
40
-40
5
-5
4. Multiple Choice
5 minutes
1 pt
Y varies inversely with x, and y is 0.5 when x is 4. Which equation represents this situation?
y=2x
y=2/x
y=4x
y=x/2
5. Multiple Choice
5 minutes
1 pt
Suppose y varies directly as x. If y = 22.5 when x = 15, find y when x = 20.
1.5
337.5
30
16.875
6. Multiple Choice
5 minutes
1 pt
Suppose y varies inversely with x. If y = 150 when x = 2, find y when x = 25.
300
75
1,875
12
7. Multiple Choice
30 seconds
1 pt
The amount of people at your Thanksgiving meal and the amount of leftovers.
Direct Variation
Inverse Variation
8. Multiple Choice
15 minutes
1 pt
A bottle of 150 vitamins costs $5.25. If the cost varies directly with the number of vitamins in the bottle, what should a bottle with 250 vitamins cost?
$3.15
$9.65
$7.75
$8.75
9. Multiple Choice
1.5 minutes
1 pt
The time to complete a project varies inversely with the number of employees. If 3 people can complete the project in 7 days, how long will it take 5 people?
12 days
4.2 days
6.2 days
10 days
10. Multiple Choice
1 minute
1 pt
Classify the equation: 15x=3y
Direct Variation
Inverse Variation
Joint Variation
Linear Equation
11. Multiple Choice
5 minutes
1 pt
The time it takes to fly from Los Angeles to New York varies inversely as the speed of the plane. If the trip takes 6 hours at 900 km/h, how long would it take at 800 km/h?