How do you write (-2, -3), (3, 5), and (8, -1) into matrix form?

Rewrite it as a column vector as shown below
(-2,  3,  8,)
 -3   5   -1

The x co-ordinates form the elements of the first row and y co-ordinates form the elements of the second row.

Note that the elements of both rows should be in one bracket.