What is the constant (k) in this inverse variation? y = 400/x
x
y
400
Not enough information given
2. Multiple Choice
2 minutes
1 pt
Determine the type of variation:
Direct
Inverse
Neither
3. Multiple Choice
2 minutes
1 pt
Which of the following represents indirect variation?
y = kx
y = k/x
y = x/k
y = mx + b
4. Multiple Choice
2 minutes
1 pt
If y varies inversely as x and x=5 when y=20, then what is the constant of variation, k?
121
4
100
6
5. Multiple Choice
5 minutes
1 pt
The cost per person to rent a mountain cabin is inversely proportional (varies inversely) to the number of people who share the rent. If the cost is $36 per person when 5 people share, what is the cost per person when 8 people share?
$22.50
$57.60
$1.11
$12.50
6. Multiple Choice
2 minutes
1 pt
Is the given table a direct or inverse variation? What is the constant of variation?
Direct, 12
Inverse, 12
Direct, 1/12
Inverse, 1/12
7. Multiple Choice
3 minutes
1 pt
If y = 15 when x = 32 find y when x = 12.
40
-40
5
-5
8. Multiple Choice
3 minutes
1 pt
Assume y varies inversely with x. If x=7 when y=4, what is y when x=2 ?
4
14
7
28
9. Multiple Choice
2 minutes
1 pt
y varies directly with x. y is 84 when x is 16. What is the constant of proportionality?
y = (21/4)x
k = 21
k = 5.25
k = 4/21
10. Multiple Choice
3 minutes
1 pt
In a direct variation, y = 39 when x = 3. Find the value of y when x = 2.
26
3
58.5
2
11. Multiple Choice
5 minutes
1 pt
Which of the following is NOT a direct variation?
y = -2x
y = 1/2x
2x + 3y = 2
3y = 4x
12. Multiple Choice
1 minute
1 pt
What is the equation for direct variation.
y=kx
y=k
y=kx+b
y=b
13. Multiple Choice
2 minutes
1 pt
A person’s weekly pay is directly proportional to the number of hours worked. Shawn’s pay is $123.00 for 20 hours of work. Find the amount of pay for 31 hours of work.
$3813
$620
$190.65
$4.96
14. Multiple Choice
2 minutes
1 pt
A dishwasher uses 65 gallons of water to wash 5 loads of dishes. What is the equation of variation?
y = 13x
y = 65x
y = 5x
y = 1/13x
15. Multiple Choice
3 minutes
1 pt
A dishwasher uses 65 gallons of water to wash 5 loads of dishes. How many gallons of water would be used to wash 12 loads?
60 gallons
780 gallons
156 gallons
12/13 gallons
16. Multiple Choice
45 seconds
1 pt
The amount of money earned on a job is directly proportional to the number of hours worked. If $70.00 is earned in 5 hours, how much money is earned in 22 hours of work?
$2
$308
$1.57
$265
17. Multiple Choice
1 minute
1 pt
Is the given table a direct variation? If so, what is the constant?
Yes; 1/4
Yes; 4
Yes; 2
No
18. Multiple Choice
2 minutes
1 pt
The equation w = 10chs represents:
direct variation
inverse variation
joint variation
none of these
19. Multiple Choice
1.5 minutes
1 pt
What type of variation does this scenario represent? The grade you earn in a class and the number of assignments you complete and the number of hours you study
direct variation
inverse variation
joint variation
none of these
20. Multiple Choice
5 minutes
1 pt
Suppose y varies jointly as x & z. If y = -180 when z = 15 and x = -3, then find y when x = 7 and z = -5.