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Help with a q please! - HSN forum

# Help with a q please!

4 replies to this topic

### #1Allan_r_123

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Posted 21 October 2007 - 03:43 PM

I was helping my girlfriend with some stuff as I got a B last year and am not bad at maths.

However, we stumbled upon what seems to be a really difficult question and I was just wondering if any of you had any ideas on how to tackle it?

Question:

By using gradients find the value of K.

CHEERS

### #2George

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Posted 21 October 2007 - 04:27 PM

I'll not post all the working; the method should be enough to get you going

Firstly, find - then, since PQR is a right-angle, you can state .

You now have the gradient of QR, and one of the points on it, so you can find its equation.

Then put x=5 into that equation, to get the coordinates of R (and k is the y-coordinate).

### #3Allan_r_123

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Posted 21 October 2007 - 04:41 PM

GENIOUS! Thank you!

### #4Connor

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Posted 13 December 2007 - 07:06 PM

I was struggling on a question just like this!
But now everything is clear!
Thanks!

Would k=-5?

### #5George

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Posted 16 December 2007 - 05:16 PM

Yes, k=-5 is the correct answer.

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