Answer
a) graph is shown in the picture
b) $y=t-2=\sqrt {x}-2$
Work Step by Step
a) for some values of $ t$ and correspending $x$ and $y$ values are shown in the table.
$x=t^{2}\Rightarrow t=\sqrt {x};$
$y=t-2=\sqrt {x}-2$
So the graph is shown in the picture
b)As we found earlier $y=t-2=\sqrt {x}-2$
