Math
posted by ~{HAPPY FACE!!}~ .
How long one can hold their breath can be calculated using the formula y=1.4g where y is the amount of time one can hold their breath in seconds and g is the size of their lungs in cubic centimeters.
Is this a relation or a function? Explain why.
Please Help!!
Thanks!!

What do you think? We will be happy to critique your thinking.
What is a function? 
A function is a relation between two sets in which one element of the second set is assigned to each element of the first set.

so there is one and only one value of y for every value of g.
therefore y is a function of g 
Thank you for your explanation.