REmember that
A relationship between x and y represent a function if for any value of x there is only one value of y
so
Verify
The relationship represent a function, because for any value of x there is only one value of y
therefore
the answer is
Is a function because no two x values are the same
Part 2
we have that
140*35=$4,900 -------> minimum earning
355*35=$12,425 -----> maximum earning
therefore