Plotting a parametric plot of two functions

Question

I have two functions f1(x) and f2(x). I want to plot them such that f1 is on the axis of ordinates and f2 on the axis of abscissae. Any ideas?

Following example to it:

f1(x)=2x and f2(x)=3x. The graph should then show a line through the following points: {(0,0),(2,3),(4,6),(6,9),...}

Answer 1

ParametricPlot[{f2[x],f1[x]},{x, begin,end}]

where you have to fill in sensable values for begin and end.

Example:

ParametricPlot[{Sin[x], Cos[5 x]}, {x, 0, 10}]

Answer 2

Perhaps you want this?

f1 = Sin;
f2 = Cos;

ParametricPlot[{{f1[x], x}, {x, f2[x]}}, {x, -2 π, 2 π}]

Different rages for f1 and f2:

ParametricPlot[
  {{f1[u], u}, {v, f2[v]}},
  {u, 0, 3 π}, {v, -2 π, 2 π},
  Mesh -> False
]

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Related: plotting on the y-axis in Mathematica