Question

Find the domain and range of the relation, and determine whether it is a function.
{(2, 1), (−4, 5), (1, 7), (2, −3), (−1, 2)}

Answer 1

The domain is all the x values so {2,-4, 1, 2, -1} 
The range is all the y values so    {1, 5, 7, -3, 2}

Yes, it is a function because each item in the domain matches one item in the ranges.