Question

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

Answer 1

Which method will you be using, elimination or substitution?

Answer 2

x = 9
y = 21

Answer 3

but my answer choose are 21
-21
9
-9

Answer 4

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

Answer 5

just need the answer

Answer 6

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

Answer 7

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

Answer 8

So what is the problem??

Answer 9

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