The equation in the image is:

$-y = \sin^{-1}(x)$

This is the inverse sine function, also known as the arcsine function. The equation can be rewritten as:

$y = -\sin^{-1}(x)$

This means that $y$ is equal to the negative of the arcsine of $x$.

Would you like more details on how to solve for $y$, or on the properties and graph of this function? Let me know if you have any questions.

Here are some related questions:

1. What is the domain and range of the function $y = -\sin^{-1}(x)$?
2. How does the graph of $y = -\sin^{-1}(x)$ compare to the graph of $y = \sin^{-1}(x)$?
3. Can you express $y = -\sin^{-1}(x)$ in terms of a trigonometric function of an angle?
4. What is the derivative of $y = -\sin^{-1}(x)$ with respect to $x$?
5. What is the integral of $y = -\sin^{-1}(x)$ with respect to $x$?

Tip: The arcsine function $\sin^{-1}(x)$ returns the angle whose sine is $x$, with the angle measured in radians.