Maths  Cartesian Equations
posted by Jichu
Find the corresponding Cartesian equation for each pair of parametric equations:
x = t  (1/t) and y = 2*[t + (1/t)]
The answer is y^2/16  x^2/4 = 1
I have no idea where to begin. I tried squaring both equations in hope to easily remove t^2 but ended up with ugly numbers. Then I tried substituting the t value (which I rearranged from x) into the y equation but also ended up with ugly numbers.
Please show your working so I can understand how you came up with the answer. Thanks for your help.

Steve
(y/2)^2 = (t + 1/t)^2 = t^2+2+1/t^2
x^2 = (t  1/t)^2 = t^22+1/t^2
y^2/4  x^2 = 4
or in standard form,
y^2/16  x^2/4 = 1
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