What is the domain and range of {(12,2);(11,10);(18,0);(19,1);(13,4)}

Question

I am really have trouble with this problem , and can not find a way to figure the problem out . I have tried and tried , but I still can’t figure it out . I am in desperate help.

Answer 1

The domain is the set of all the abscissas (x values, or first elements of the ordered pairs):

{12, 11, 18, 19, 13}

 

The range is the set of all the ordinates (y values, or second elements of the ordered pairs):

{2, 10, 0, 1, 4}

 

The most general way of defining a function is by stating the set of ordered pairs which make it up...and if it is correctly a function, then no two ordered pairs will have the same first element but a different 2nd element.