Question
Determine whether each equation defines $y$ as a function of $x .$$$y=-\sqrt{x+4}$$
Step 1
A relation between two variables, $x$ and $y$, defines $y$ as a function of $x$ if for each value of $x$, there is exactly one corresponding value of $y$. This is often referred to as the vertical line test in graphical terms. Show more…
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