What is the value of the x variable in the solution to the following system of equations?
7x - 2y = 21
4x + y = 57

Question

anonymous · Answer

Which method will you be using, elimination or substitution?

anonymous · Answer

x = 9 
y = 21

anonymous · Answer

but  my answer choose are 		21
		-21
		9
		-9

anonymous · Answer

Hmmm ... which method did you use?  Or do you just need the answer?

anonymous · Answer

just need the answer

anonymous · Answer

oh .... I am here to help with a study group ...

anonymous · Answer

Doodle Tech has the correct answer, I am not sure why your multiple choice question does not ..

anonymous · Answer

So what is the problem??

anonymous · Answer

This is how I did it. I multiplied the second equation by 2, and added both equations to eliminate y.
7x - 2y = 21
8x + 2y = 114

15x        = 135
    x        =  9