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is the line through points P(-8,10)and Q(-5,-12) perpendicular to the line through points R(9,-6) and S(17,-5)? Explain

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PQ has slope (12-10)/(-5+8) = 2/3
RS has slope (-5+6)/(17-9) = 1/8
so the lines are not ⊥
why not?

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