A
B
C
D
Explanation
Correct answer: C.
Choice C is correct. Adding the given equations yields . Dividing each side of the equation by gives .
Desmos solution:
Enter in Desmos:
Reviewed and rewritten by CookSAT
Why the other choices are wrong
Choice A
Choice A is incorrect and may result from incorrectly adding the equations.
Choice B
Choice B is incorrect and may result from conceptual or computational errors.
Choice D
Choice D is incorrect. This value is equivalent to .