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I want to draw this line:

ParametricPlot[{-2 (-5 + t), 5 + t}]

And this circle, radius 25:

ContourPlot[x^2 + y^2 == 25]

On the same graph.

No matter what combination I use, I can't get them overlaid on the same graph.

Is there any way to do this? I will also consider other web apps that may be able to do this.

share|improve this question

x= -2 (-5 + t) (1)
y= 5 + t (2)

t = y - 5;

Substitute into (1)

y = -(1/2)x + 10

ContourPlot[x^2 + y^2 == 25 , y == -(1/2)x + 10]

You can also try the reverse and change to parametric. That could be left as an exercise.

share|improve this answer
This works also in Google search: enter (25-x^2)^0.5,-(25-x^2)^0.5 ,-(1/2)x+10 in the search box and zoom out. – Itamar Jan 18 '12 at 16:20

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