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Please ANSWER ASAP

Dorothy is trying to prove that △PQR is a right triangle.

The vertices of △PQR are at P(-2,5), Q(-1,1), and R(7,3).

Which TWO slope calculations can she use to correctly show that △PQR is a right triangle?
Select TWO of the answers below.
in the picture

Please ANSWER ASAP Dorothy Is Trying To Prove That PQR Is A Right Triangle The Vertices Of PQR Are At P25 Q11 And R73 Which TWO Slope Calculations Can She Use T class=