reflect the point -9,0 across the y axis

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

The original point is \((-9, 0)\). Reflecting it across the y-axis results in the point \((9, 0)\).

Therefore, the reflection of the point \((-9, 0)\) across the y-axis is \((9, 0)\).