
Direct, Inverse, Jointly
Authored by Anthony Clark
Mathematics
9th Grade

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15 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What type of variation does this scenario represent?
The outside temperature
and the number of layers of clothes you need to wear outside to feel comfortable
direct variation
inverse variation
joint variation
none of these
2.
MULTIPLE CHOICE QUESTION
1 min • 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
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What type of variation does this scenario represent?
You and some friends decide to buy 2 pizzas and split the cost evenly.
The number of friends who are sharing the cost of the pizzas
and the amount of money you pay for your share.
direct variation
inverse variation
joint variation
none of these
4.
MULTIPLE CHOICE QUESTION
1 min • 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
5.
MULTIPLE CHOICE QUESTION
1 min • 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.
-140
140
-4
4
6.
MULTIPLE CHOICE QUESTION
1 min • 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 QUESTION
1 min • 1 pt
Variation Types
direct variation
inverse variation
neither direct nor inverse variation
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