Let x and y be real numbers and x = $\begin{cases}(x,y) |y = \frac{1}{2} & x \neq 0\end{cases}$ y = $\begin{cases}(x,y) |y = -x \end{cases}$ be two sets then

Let x and y be real numbers and x = $\begin{cases}(x,y) |y = \frac{1}{2} & x \neq 0\end{cases}$ y = $\begin{cases}(x,y) |y = -x \end{cases}$ be two sets then
1). $x\bigcap y$ =x
2). $x\bigcap y$ =y
3). $x\bigcap y$ =$\phi$
4). $x\bigcup y$ =x

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