Switch the x and y coordinates and multiply the first first coordinate (the new x coordinate) by -1
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rotate it 90 degrees
You dont, its just 90 degrees 3 times..
I dont really know if this is right but i think to do this problem you have to take a point then rotate the paper counter clockwise around the origin then you have a new point which is called a prime. Then reflect it over the y axis on the graph.
stick your arms straight out in front of you. Pretend that's twelve o'clock then move one of your arms to three o'clock. Bring the other arm and turn your body to three o'clock. you have just moved 90 degrees clockwise.
the answer would be 180 degrease and if you don't believe me go on another website...