reflect the point -9,0 across the x axis

To reflect the point \((-9, 0)\) across the x-axis, you simply change the sign of the y-coordinate. The x-coordinate remains the same.

The original point is \((-9, 0)\). Reflecting it across the x-axis gives:

\((-9, -0)\)

Since \(-0\) is the same as \(0\), the reflected point is:

\((-9, 0)\)

So, the point \((-9, 0)\) remains unchanged when reflected across the x-axis.