Answer
$$ y =(x-3)^2-9$$ $$ \text{ Parabola }$$
Work Step by Step
We have: $x=4t+3 \implies t=\dfrac{x-3}{4}$ and $y=16 t^2-9$
Now, $$y=16t^2-4 \\y=16 (\dfrac{x-3}{4})^2-9 \\ y =(x-3)^2-9$$
This shows an equation for a parabola.
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