DIRECT VARIATION

QuizÂ by okeke abraham

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10 questions
• Q1
Which graph shows a proportional relationship between x and y?
C
B
D
A
30s
• Q2
Write an equation for this relationship
y = 4xy
y = 1/8xy
y = 1/3X
y = 1/4x
30s
• Q3
In a direct variation, y = 39 when x = 3. Find the value of y when x = 2.
13
5
26
21
30s
• Q4
Is the given table a direct variation? If so, what is the constant?
Yes; 4
Yes; 2
NO
Yes; 1/4
30s
• Q5
y varies directly with x. When y = 39, x = 3. Find the value of y when x = 2.
8
4
12
26
30s
• Q6
Is this a direct variation? y = 2x
YES
NO
30s
• Q7
Write the equation for the table given.
y = 5x
y = 3x
y = 6x
y = 4x
30s
• Q8
What ordered pair does a direct variation always go through when graphed? What ordered pair does a direct variation always go through when graphed?
(0,1)
(0,0)
(1,0)
(1,1)
30s
• Q9
The number of hours to paint a house varies inversely with the number of painters working. A 2400-square foot house can be painted in 27 hours by 6 painters. How many painters would need to work in order to paint the house in 18 hours?
6 painters
9 painters
7 painters
12 painters
30s
• Q10
The gas pressure in a chamber varies directly with the temperature in the chamber. If the pressure in the chamber is 150 atmospheres (atm) when the chamber is at 50 degrees, what is the pressure in the chamber when the temperature of the chamber is 75 degrees?
265 atm
500 atm
225 atm
222 atm
30s

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