MATH help

sketch + describe graph of the curve parametrized by:

-infinity less than t less than infinity

how would i go about solving this.
i know that usually i can solve for t and than plug that in. But for this, i tried using cos^2 + sin^2 = 1... but i'm stuck

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  1. cos^2(t)=(1-x)/3

    Add two equations

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  2. i don't really understand parametrized curves. but isn't y=(4/3)x +(2/3) a straight line. So, it doesn't have to be a curve?

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  3. Straight line is a special case of the curve just like the natural numbers are a special case of integers

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