An architect is designing a new windmill with four sails. In his sketch, the sails' center of rotation is the origin, (0,0), and the tip of one of the sails, point S, has coordinates (5,4). He wants to
make another sketch that shows the windmill after the sails have rotated 90° about their center of
rotation. What would be the coordinates of S'?
The coordinates of S' would be___