SOLUTION: Which of the following is an inverse variation? A: Sally works 2 hours and earns 10 dollars, if she works 4 hours she earns 20 dollars B: A car travels 200 mile

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Question 686928: Which of the following is an inverse variation?

A:
Sally works 2 hours and earns 10 dollars, if she works 4 hours she earns 20 dollars

B:
A car travels 200 miles in 4 hours, it travels 100 miles in 2 hours.

C:
A biker traveling 8mph covers 8 miles in 1 hour, if he decreases his speed to 4mph it will take him 2 hours to cover the same distance

D:
A pond of 1 acre has 2000 fish, a pond of 3 acres has 6,000 fish

Found 2 solutions by MathLover1, stanbon:
Answer by MathLover1(20849) (Show Source):
You can put this solution on YOUR website!
Inverse variation: when one variable increases,the other variable decreases.

a biker traveling at can cover in . If the biker's speed decreases to , it will take the biker (an increase of one hour), to cover the same distance.

the graph of inverse variation shows if the value of is increased, then decreases.
If decreases, the value increases. We say that varies inversely as the value of
so, your answer is

Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website!
Which of the following is an inverse variation?
A:
Sally works 2 hours and earns 10 dollars, if she works 4 hours she earns 20 dollars
Ans: Direct
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B:
A car travels 200 miles in 4 hours, it travels 100 miles in 2 hours.
Ans Direct
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C:
A biker traveling 8mph covers 8 miles in 1 hour, if he decreases his speed to 4mph it will take him 2 hours to cover the same distance
Ans: rate and time are inversely relate:: d = r*t
As r increases t must decrease if d is to remain the same
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D:
A pond of 1 acre has 2000 fish, a pond of 3 acres has 6,000 fish
And: Direct
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Cheers,
Stan H.
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