I don't think you provided all the options.
Because of this, I'm providing a guess until you have the time to provide the other equations...
I'd say the correct answer is:
[tex]y = \frac{1}{2} x + 3[/tex]
Again, this is JUST an assumption.
I attached a screenshot in case you wished for relatively adequate proof.
If you can, please provide the other answer options, so I can give a more accurate answer. :)
