Here's the question you clicked on:
ripleycole
What would be the coordinates of the image of (10,-4) rotated clockwise about the origin through a 90° angle? Be sure that your answer is in (x,y) notation.
you might notice that: after the rotation, x and y change their values and their quadrant. As this point is in the fourth quadrant, rotating 90 degrees about origin gives the third quadrant. so, the point will be (-4,-10), where both x and y are negative because they are in the third quadrant.