Answer:
The slope of ( -2 , -5) and ( -1 , -2) is perpendicular to this line
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The slope is given by the expression:
ΔY/ΔX
where
ΔY = Y₂ - Y₁
ΔX = X₂ - X₁
slope = ΔY/ΔX
slope = (Y₂ - Y₁)/(X₂ - X₁)
slope = (2 - 5)/(- 1 - 2)
slope = (- 3)/(- 3)
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