If the ordinate equals the abscissa and x ∈ {-3, 0, 12}, which of the following sets of ordered pairs satisfies the given conditions?
{(3, -3), (0, 0), (-12, 12)}
{(-3, 3), (0, 0), (12, -12)}
{(-3, -3), (0, 0), (12, 12)}

For point with coordiantes (x,y), the abscissa is the x-coordinate and the ordinate is the y-coordinate. So, all you have to do is match the given x values with the second term inside the parenthesis. Also, the x values must also be the same as given. From the choices, the answer is {(-3, -3), (0, 0), (12, 12)}