y = 3 x 2 x + y = 12 The solution to the given system of equations is x

Question

y = 3 x 2 x + y = 12 The solution to the given system of equations is x , y . What is the value of 5 x ?

Accepted Answer

Choice C is correct. It's given by the first equation in the system that y = 3 x . Substituting 3 x for y in the equation 2 x + y = 12 yields 2 x + 3 x = 12 , or 5 x = 12 . Choice A is incorrect and may result from conceptual or calculation errors. Choice B is incorrect and may result from conceptual or calculation errors. Choice D is incorrect and may result from conceptual or calculation errors.

Question y-3-x-