Answer:
A. 39°
Step-by-step explanation:
Complementary angles total 90°. The angle of interest is ...
90° -51° = 39°
Answer
I think it’s B
Explanation
The ordered pair that is the solution to the system of
equations cane be solve by adding the two term
(x+ y=−13)+ (x−y=21) = (2x = 8)
X = 4
Substitute x to the first equation
4 +y = -13
Y = -17