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Date May 2021 Marks available 2 Reference code 21M.1.AHL.TZ2.14
Level Additional Higher Level Paper Paper 1 Time zone Time zone 2
Command term Find Question number 14 Adapted from N/A

Question

A geometric transformation T:xyx'y' is defined by

T:x'y'=7 -102 -3xy+-54.

Find the coordinates of the image of the point (6, 2).

[2]
a.

Given that T:pq2pq, find the value of p and the value of q.

[3]
b.

A triangle L with vertices lying on the xy plane is transformed by T.

Explain why both L and its image will have exactly the same area.

[2]
c.

Markscheme

7 -102 -36-2+-54             (M1)

=5722  OR  57, 22            A1


[2 marks]

a.

2p2q=7 -102 -3pq+-54             (M1)

7p-10q-5=2p

2p-3q+4=2q             (A1)

solve simultaneously:

p=13, q=6           A1

 

Note: Award A0 if 13 and 6 are not labelled or are labelled the other way around.


[3 marks]

b.

det7 -102 -3=-1  OR det 7 -102 -3=1             A1

scale factor of image area is therefore -1=1 (and the translation does not affect the area)      A1


[2 marks]

c.

Examiners report

[N/A]
a.
[N/A]
b.
[N/A]
c.

Syllabus sections

Topic 3—Geometry and trigonometry » AHL 3.9—Matrix transformations
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Topic 3—Geometry and trigonometry

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