SOLUTION: Find the value of k so that the line containing the points (-1,-5) and (-3,k) is perpendicular to the line containing the points (-7,-1) and (0,-7).

Question 1095806: Find the value of k so that the line containing the points (-1,-5) and (-3,k) is perpendicular to the line containing the points (-7,-1) and (0,-7).
Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
Slope of first pair:

Slope of second pair:

Lines to be perpendicular means product of slopes .

(still need to be rechecked)

Answer by MathTherapy(10552) (Show Source): You can put this solution on YOUR website!
Find the value of k so that the line containing the points (-1,-5) and (-3,k) is perpendicular to the line containing the points (-7,-1) and (0,-7).

Correct answer:
IGNORE anyone who says otherwise.
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