Reflecting the coordinates of D(-2,1) across the x-axis results in D'(-2, -1), where the y-coordinate changes sign while the x-coordinate remains the same.
The coordinates of point D' can be determined by reflecting the coordinates of D(-2,1) across the x-axis.
When a point is reflected across the x-axis, the y-coordinate changes sign while the x-coordinate remains the same. In this case, since D has coordinates (-2,1), the x-coordinate remains -2, and the y-coordinate changes sign. Therefore, the y-coordinate of D' is -1.
So, the coordinates of D' are (-2, -1). The reflection across the x-axis transforms the point (x, y) to the point (x, -y). Applying this transformation to D(-2,1) results in D'(-2, -1).
Complete question:
Point D' is the image of D(-2,1) under a reflection across the x-axis. What are the coordinates of D’?