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I could not find something similar. Suppose that I want the lines y=1 and x=1. I can do it with Plot and Epilog or GridLines. But how can I insert the representation of the vertical line in a legend that contains also the function y=1?

P.s. I am writing the message with the mobile phone. No access to Mathematica right now.

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You can use ContourPlot

ContourPlot[
 {x == 1, y == 1, (x - 1)^2 + (y - 1)^2 == 1},
 {x, 0, 2}, {y, 0, 2},
 PlotLegends -> "Expressions"]

enter image description here

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There's also this hacky way:

Plot[{1, 100 Sign[x - 1]}, {x, -3, 3}, PlotRange -> {{0, 2}, {0, 2}}, 
 PlotStyle -> {Blue, Red}, ExclusionsStyle -> Red, AspectRatio -> 1, 
 PlotLegends -> {"y=1", "x=1"}]

enter image description here

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