Question $2$: $25$ Marks

Consider the following piecewise function

$f(x)=\{\begin{array}{ccc}4-2x^2& if& x=y\end{array}$

Write a MuPAD code that plots the graph of the function $f$ for $-1x1$ and $-1y1.$ The graph object must have a sky blue background with a blue foreground. The axis must be properly labelled and blue. The $x-$axis must be $0\mathrm{.}2$ incremented, and the $y-$axis and $z-$axis are $1$ incremented.

Hint: Use piecewice function.