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# Perpendicular lines

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1. On a revision sheet I got today I found a question which I don't quite get, it is as follows: "The line ABC has the equation y=3x+2. AB=BC. D has the coordinate (1 2/3). Find the equation of the line through C and D." The line ABC is perpendicular to line CB and intersects the line ABC at C.
2. (Original post by Katjov)
On a revision sheet I got today I found a question which I don't quite get, it is as follows: "The line ABC has the equation y=3x+2. AB=BC. D has the coordinate (1 2/3). Find the equation of the line through C and D." The line ABC is perpendicular to line CB and intersects the line ABC at C.
The gradients of two perpendicular lines m1 and m2 satisfy the relation m1 * m2 = -1.
3. Thx
4. (Original post by Katjov)
Thx
No problem.

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