You can put this solution on YOUR website! By definition, a function is a rule that assigns to each element
in its domain , called , in its range.
you are given the function
rearrange it:
now find out what are the domain and range of
domain: (all real numbers) or (,)
range: { element : } or (,)
since each element in its domain , is a function
or, simply graph it and use vertical line test:
as you can see, both vertical lines intersect graph in exactly one point
