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Maths help

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Q80BOY:

--- Quote from: pedrojosetrujillo on May 16, 2009, 01:03:11 pm ---Thanks man really aprrecitate it. My teacher couldnt tell me this stuff when i asked him. Anymore i would need to knw?

--- End quote ---

enlargements, e.g.

enalrgement of scale factor 2 is 2 0
                                           0 2

enlargement of scale factor -2 is -2 0
                                              0 -2

gd luck  ;)

guru007:

--- Quote from: Q80BOY on May 16, 2009, 01:02:02 pm ---
--- Quote from: pedrojosetrujillo on May 16, 2009, 01:01:25 pm ---Im doing jun 05 paper 4 and it asks me to find the 2x2 matric which represents the transformation that maps x onto q. X onto q is a reflection on the y=-x axis. What would be the the 2x2 i would need? Like the general formula.

--- End quote ---

the matrix for reflection in line y=x is 0 1
                                                  1 0

the matrix for refection in line y=-x is 0 -1


hey gr8 +rep right away !!

I was stuck with this in the specimen paper 2.
U gave me a sugh of relief really !!!!
                                                  -1 0

the matrix for clockwise rotation of 90 degrees about the origin is 0 1
                                                                                       -1 0

the matrix for anticlockwise rotation of 90 degrees about the origin is 0 -1
                                                                                             1  0


--- End quote ---

hitham_1221:
u always start with the matrix
{1 0}
{0 1}
then u modify it to fit the transformation
in this case it will become
{0 -1}
{-1 0}
hope u understand  :)

victorfrost:
oh u might also need
strech=k 0 =this is when parallel y axis
          0 1

        =1 0 =this is when parallel to x axis
          k 1

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