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 miles in 4

Algebra ->  Test -> 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 miles in 4      Log On


   



Question 686923: 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


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

a biker traveling at 8+mph can cover 8+miles in 1hour. If the biker's speed decreases to 4+mph, it will take the biker 2hours (an increase of one hour), to cover the same distance.

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