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# Matrix question from FP1 edexcel book watch

1. I'm self teaching from the new edxcel FP1 book (the green one written by Keith Pledger) and I've come across a question where the provided answer doesn't make sense to me...

Q15, Review exercise 2

The transformation T maps the point with coordinates (1,0) to the point with co-ordinates (3,2), and the point with coordinates (2,1) to the point with coordinates (6,3). T is represented by the (2x2) matrix M. Find M.

They give the answer M= (3, -4)
(2, -3)

but I get M = (3, 0)
(2, -1)

If Pledger is right, how come?
2. That didn't render right, let me try again

(3, -4)
(2, -3)

(3, 0)
(2, -1)
3. Your answer is right. A quick way to check is to multiply M by (1,0) and (2,1) and check you get the desired answers (technically they should be column vectors but you get the idea).

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Updated: January 29, 2010
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