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eldo
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Plot[{4, 0}, {x, -2, 2},
 Epilog -> {Blue, PointSize@Large, Point[{1, 4}]},
 PlotStyle -> {{Red, Dashed, Thickness[0.004]}, {Red, Dashed, 
    Thickness[0.004]}},
 PlotRange -> {-1, 6}]

enter image description here

eldo
  • 83.1k
  • 6
  • 72
  • 202