Step 1. The point we have is:

We will label this point as (x, y):

Step 2. We need to make a rotation of this point about the origin,
The rule for a rotation of 90° about the origin clockwise is:

Step 3. Applying the transformation from step 2 to the point from step 1:

We put the old y-value in the place of the new x-value, and we put the old x-value in the place of the new y-value with the opposite sign.
(-5,-5) is the result.
Answer:
(-5, -5)