Answer:
b. (2,0)
Step-by-step explanation:
To find which ordered pair is a solution, we have to replace then into the equation, and the result has to be an identity, that is, 0 = 0.
Equation:

Option a:
, so 




Not an identity, so this ordered pair is not a solution.
Option b:
, so 




Identity, and thus, the correct answer is given by option b.
Ummmmmm it's asking u to count the sides adding them and subtracting them
D/c = 6/7 => d = 6c/7
d + c = 52
6c/7 + c = 52
6c + 7c = 364
13c = 364
c = 364÷13
c = 28
d = 52 - 28
d = 24