The formula is (x,y) -> (y,-x).
Verbal : switch the coordinates ; then change the sign of the new x coordinate.
Example : (2,1) -> (1,-2)
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{1 0} {0 -1}
Rotating a triangle 90 degrees counterclockwise would involve taking an upright triangle and laying is toward the left on its back. Changing position through rotation can cause a better visualization for some problem solving.
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, -4) rotated 90 degrees anticlockwise
turn one quarter of the way.