A
B
C
D
Explanation
Correct answer: C.
Choice C is correct. The given system of linear equations can be solved by the substitution method. Substituting for from the first equation in the given system into the second equation yields , or .
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 conceptual or calculation errors.
Choice B
Choice B is incorrect and may result from conceptual or calculation errors.
Choice D
Choice D is incorrect. This is the absolute value of , not the value of .