A line containing the points (-2,3) and (2,3) is reflected across the X axis. How long is the reflected line?
3 units
Not enough information
Infinitely long
4 units
The reflected line would be 4 units long.
When a line is reflected across the X-axis, the Y-coordinates of the points on the original line change sign. In this case, the original line contains the points (-2,3) and (2,3). When reflected across the X-axis, the points become (-2,-3) and (2,-3).
The distance between (-2,-3) and (2,-3) is 4 units, so the reflected line is 4 units long.