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# Coordinate geometry HELP Watch

1. I don't know why but I can't seem to do this question, any help would be appreciated...
Find the equation of the line through point (2,6) which is perpendicular to the line PQ whose equation is 2y-x=5
2. (Original post by Wordnerd2)
I don't know why but I can't seem to do this question, any help would be appreciated...
Find the equation of the line through point (2,6) which is perpendicular to the line PQ whose equation is 2y-x=5
Okay so you are given a point and you should immediately be thinking of to construct your line.

Next is figuring out the gradient, . You are told that this line perpendicular to , therefore you know that the gradient's on these two lines must be negative reciprocal's of one another. Take this line and rearrange it into the form . Then take the negative reciprocal of and this will be your perpendicular gradient, .
3. (Original post by jsk800)
This question does not match to the coordinate, as the line 2y-x=5 does not go through (2,6), which would otherwise be the point at which both lines meet.
lol wat

They don't intersect at (2,6) and they don't have to.
4. (Original post by rdkgames)
okay so you are given a point and you should immediately be thinking of to construct your line.

Next is figuring out the gradient, . You are told that this line perpendicular to , therefore you know that the gradient's on these two lines must be negative reciprocal's of one another. Take this line and rearrange it into the form . Then take the negative reciprocal of and this will be your perpendicular gradient. .
thank you !!!
5. (Original post by Wordnerd2)
thank you !!!
6. (Original post by Wordnerd2)
I don't know why but I can't seem to do this question, any help would be appreciated...
Find the equation of the line through point (2,6) which is perpendicular to the line PQ whose equation is 2y-x=5
When a line A is perpendicular to Line B, the gradient of line A multiplied by the gradient of line B is -1.

So rearrange the equation 2y-x = 5 to find the gradient, then try going from there.

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