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How do I make the normal line to a plane actually look perpendicular?

cc = Plot3D[2 x + y, {x, -2, 2}, {y, -2, 2}, PlotRange -> {-4, 4}]

bb = ParametricPlot3D[{2 t, t, -t}, {t, -1, 1}, PlotStyle -> Thick]

Show[cc, bb]

Mathematica graphics

The line doesn't look even close to perpendicular to the plane.

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The reason is that the three axes use different scales by default to avoid extreme elongation in case the range of one axis is much larger than the others.

Use

Show[cc, bb, BoxRatios -> Automatic]

Mathematica graphics

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