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    Mathematica [Mathematica]Plotting 3D line with data point

    I can use the Show function to combine multiple plots, so I know how to plot data points and a calculated fit line in 2D, but now I want to do the same in 3 dimensions. I can plot the data points just fine in 3D, but I don't know how to draw a straight line with a know equation in 3D. My...