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Answer: Choice A 
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The R stands for "rotation". The "O" as a small subscript means "origin" which is where the x and y axis cross. The 90 degrees means we rotate 90 degrees counterclockwise. This is equivalent to 270 degrees clockwise, but writing
is not correct as we don't rotate 270 degrees counterclockwise.
Answer:
C. This was hard to do when I had this question
Answer:
Step-by-step explanation:
The slope of line e is -6/7
The slope of perpendicular lines are negative reciprocals which means the flip and turn negative.