Suppose that $x = 9t^2$ and $y = \frac { 1 } { 2 - ( 3 t ) ^ { 2 } }$. .

1. Express $y$ as a function of $x$.

   Hint (a):

   Look at the equation for $y$. $(3t)^2 = 9t^2$

2. Express $x$ as a function of $y$.

   Step (b):

   Solve your equation from part (a) for $x$.

3. How will the graph of the parametric equations above be different if $x = u$ and $y = \frac { 1 } { 2 - u }$?