Respuesta :

Given a point with coordinates (x, y), to rotate 90º counterclockwise, the rule is:

[tex](x,y)\Rightarrow(-y,x)[/tex]

In thisc ase, we have the point:

[tex](2,-1)[/tex]

Applying the rule:

[tex](2,-1)\Rightarrow(1,2)[/tex]

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