How do I label different curves in Mathematica?

Question

How can I label each of these lines separately :

Plot[{{5 + 2 x}, {6 + x}}, {x, 0, 10}]

Answer 1

You can insert legends in your plot by loading the PlotLegends package

<{"5+2x","6+x"},LegendShadow->None,
    LegendPosition->{0.3,-0.5},LegendSpacing->-0,LegendSize->0.5]

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However, let me also note my dislike of this package, primarily because it's extremely counterintuitive, laden with too many options and does not provide a clean experience right out of the box like most of Mathematica's functions. You will have some fiddling around to do with the options to get what you want. However, in plots and charts where you do want a legend, this can be handy. Also see the comments to this answer and this question.