Which of the following represents “the sum of the abscissa and the ordinate is negative four”? a. x + y = -4 b. xy = 4 c. 4x + 4y = 0

A

When you are working with coordinate points, the x-value in the point is called the abscissa. The y-value in the point is called the ordinate. 

Therefore all you have to do is add the x and y of the coordinates to get our equation. Don't forget that the sum has to be -4 according to the problem.

What am i doing here. add?