Solve the system r + s = -12 4R - 6s = 12 A. -4,-8B -6,-6C -4,8D Infinitely many solutions

 r + s = -12 so r = -s - 12
4r - 6s = 12

substitute r = -s - 12 into 4r - 6s = 12

4r - 6s = 12
4(-s - 12) - 6s = 12
-4s - 48 -6s = 12
-10s = 60
     s = -6

r = -(-6) - 12
r = 6 - 12
r = -6

answer
B -6,-6