SOLUTION: Find the value of k if the line joining (3,k) and (5,7) is perpendicular to the line containing the points (1,7) and (-4,-8).

Algebra ->  Linear-equations -> SOLUTION: Find the value of k if the line joining (3,k) and (5,7) is perpendicular to the line containing the points (1,7) and (-4,-8).      Log On


   

Question 1072624: Find the value of k if the line joining (3,k) and (5,7) is perpendicular to the line containing the points (1,7) and (-4,-8).
Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
%287-k%29%2F%285-3%29=-%28%281%2B4%29%2F%287%2B8%29%29

%287-k%29%2F2=-1%2F3

%28k-7%29%2F2=1%2F3

3%28k-7%29=2

3k-21=2

3k=2%2B21=23

k=23%2F3




-
Sign Mistake :
3%287-k%29=2

21-3k=2

3k=21-2
k=cross%2819%2F3%29

Answer by MathTherapy(10552) About Me  (Show Source):
You can put this solution on YOUR website!

Find the value of k if the line joining (3,k) and (5,7) is perpendicular to the line containing the points (1,7) and (-4,-8).
highlight_green%28matrix%281%2C3%2C+k%2C+%22=%22%2C+23%2F3%29%29

Nothing more, nothing less. Ignore all other answers as they are INCORRECT.