A
B
C
D
Explanation
Correct answer: A.
Choice A is correct. The first equation in the given system of equations is . Substituting for in the second equation in the given system of equations yields , or .
Desmos solution:
Enter in Desmos:
Reviewed and rewritten by CookSAT
Why the other choices are wrong
Choice B
Choice B is incorrect. This is the value of in the solution to the given system of equations, not the value of .
Choice C
Choice C is incorrect and may result from conceptual or calculation errors.
Choice D
Choice D is incorrect and may result from conceptual or calculation errors.