The x,y origin is 0,0
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You rotate everything to the left, 3/4 of a full turn.As an example of the result, the positive x-axis winds uppointing down from the origin.
Ex: -1,-2 Switch the numbers, so with the example it would be -2,-1. Next multiply your x coordinate by -1,so the example would be 2,-1
{1 0} {0 -1}
multiply the coordinates by -1.
You have to switch the x and y coordinates and multiply your new x coordinate by -1. You can also dram the point and rotate your paper physically by 90 degrees. Example: Your Coordinates: (3,8) New Coordinates: (-8,3) (3,8) ---> (8,3) ---> (-8,3) Another Ex: (-7,-1) --> (-1,-7) --> (1,-7)