This is a video tutorial I made to answer a question posted by Sabrina, one of the students who commented on my post

http://www.epitomeofsuccess.com/2010/03/24/spm-add-math-solving-simultaneous-equation-video-1/

Here’s the question she asked

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sabrina

March 24th, 2010 at 9:32 pm editcan you help me to solve this add math question? No diagram is given for this question. PQR is a right angled triangle with its point R lying on the line y=3x. P is (5,5)and Q is (2,1). Find the two possible coordinates of R.

March 24th, 2010 at 9:32 pm editcan you help me to solve this add math question? No diagram is given for this question. PQR is a right angled triangle with its point R lying on the line y=3x. P is (5,5)and Q is (2,1). Find the two possible coordinates of R.

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and here’s the video tutorial I made to solve the question.

Thank you for the solution. Can I form right angled at P and Q besides at R? I have tried but I got different coordinates.

Yes you can. Actually the question didn’t specify where is the right angle so it’s quite ambiguous. However, the clue is the question asks to ‘find the possible coordinates” which tells me that there are 2 possible answers. If you form right angle at P and Q, there’s only one possible coordinate for R.

Can I know where did you find this question from?

From school form 4 add math textbook.