Which statements are true about the ordered pair (5, −6) and the system of equations? {x+y=−1
{3x−y=21

Select each correct answer.
A. The ordered pair (5, −6) is a solution to the first equation because it makes the first equation true.
B. The ordered pair (5, −6) is a solution to the second equation because it makes the second equation true.
C. The ordered pair (5, −6) is not a solution to the system because it makes at least one of the equations false.
D. The ordered pair (5, −6) is a solution to the system because it makes both equations true.