Answer: The image ∆P'Q'R' on the coordinate plane is attached.
Explanation:
A rotation is defined as a transformation in which a figure is rotated about a point called "The center of rotation"
The Rule for 90° counterclockwise rotation about the origin is:
→

Observe in the picture that the coordinates of the vertices of the triangle PQR are :

Therefore, applying the Rulefor 90° counterclockwise rotation about the origin we get that the coordinates P'Q'R' are:

Knowing these coordinates, you can draw it on the coordinate plane (Observe the picture attached)