Why is y = (2m) cos (kx) dimensionally correct?

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mooneh
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y = (2m) cos (kx), where k = 2 m^-1

it says that the equation is dimensionally correct but i don't understand why...
 

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I'll assume y is a distance, such as the position of a point on a wave. Consider this:

What are the units of all the terms in the equation? i.e. the units of the 2 outside the cosine, and the units of what is in the cosine argument.

Using dimensional analysis, what are the units of y?