Here are bar chart and line plot graphics:

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Combine the graphics into a single graphic using Show:

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  • The scaling of the first graphic is used when graphics are combined, which may cause the scaling of the second graphic in the combination to change.
  • Use GraphicsGrid to make a grid of graphics. See Put Graphics in a Grid for details.
Notes
You can combine any number of graphics:
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You can specify the appearance of the result with options to Show:
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Elements in subsequent graphics that lie outside of the range of the first graphic will be clipped:
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Specify an explicit plot range to include them:
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Because the options of the first graphic (such as PlotRange and AspectRatio) determine the options of the result, the order of arguments in Show can have a large effect on the appearance of the output:
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Locations of elements in combined graphics are determined by their coordinate values:
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Use Overlay to stack graphics:
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You can plot multiple datasets directly with plotting and charting functions (without having to combine graphics):
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Show also works with 3D graphics. Here are two 3D graphics, a plot of a helix and a sphere:
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Combine the graphics:
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