15. 7 points and brainliest answer if you get it right

Rule for a 90° counterclockwise rotation :

This is the same as a 270° clockwise rotation which is : ( x , y ) ==> ( - y , x )

In other words, flip the x and y numbers and make the y change its sign.

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( x , y ) ==> ( - y , x )

( - 1 , 10 ) ==> ( - 10 , - 1 )

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Answer : your third answer option...
( - 10 , - 1 )

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I hope that helps you out!!

Any more questions, please feel free to ask me and I will gladly help you out!!

~Zoey