Parametric Equation with a Parameter and an Angle

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So, just now I was doing computing some parametric equations and graphing them when I came across a weird problem. I attempted to search for a solution, but I don't think I was able to describe what I meant well enough to get any useful results.

$x=t\cos(\theta) $ and $y = t \sin(\theta)$, $t>0$ over the interval $[0,\pi]$

I was able to eliminate the parameter to get $ y = x \tan(\theta)$. The problem I am having is what do I do with the $\theta$?

All help is greatly appreciated.

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HINT

$\theta$ is a parameter. We have equation $$x=0$$ when $\cos\theta=0$ and $$y=x\tan\theta$$ when $\cos\theta\not=0.$