Question 686928
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}}}