Step-by-step explanation:
yes, it is a function. why ?
because every used x value has one unique y value assigned. that is the definition of a function. if any x value could lead to 2 or more different results (y values), it is not a function.
the domain is the interval/set of valid x (input) values to the function.
the range is the interval/set of produced and valid y (functional result) values.
so, the domain is the set of all the x values of the ordered pairs
{-7, 1, 4, 5, 8}
the range is the set of y values corresponding to the used x values
{-9, -7, -2, 3, 8}
