Determine whether y varies directly with x. If so, find the constant of variation k and write the equation.
x y
4 6.4
7 11.2
10 16
13 20.8
Please show your work and give me an explanation. I have a test coming up and I am really stuck on these types of questions. I'd like to write this in my notebook for future reference and practice. :) Thanks! Will medal/fan as always.

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y=kx

I'm really not sure how to do it at all. :(

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