# Ordered how?

**Algebra**Level 3

\[ \large \begin{cases} { \sqrt{x+y} - \sqrt{x-y} = \sqrt y } \\ { x^2-y^2=144 } \end{cases} \]

Find the number of all ordered pairs \((x,y) \) that satisfies the equations above.

\[ \large \begin{cases} { \sqrt{x+y} - \sqrt{x-y} = \sqrt y } \\ { x^2-y^2=144 } \end{cases} \]

Find the number of all ordered pairs \((x,y) \) that satisfies the equations above.

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