Maths help

[pedrojosetrujillo]

Does anyone knw what the rotation, relfection, shear and stretch matrices are?

[hitham_1221]

EASY!!! wt exactly u want???
cuz for every1 it depends on the position and scale factor if any.

[pedrojosetrujillo]

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.

[Q80BOY]

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.

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

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

[pedrojosetrujillo]

Thanks man really aprrecitate it. My teacher couldnt tell me this stuff when i asked him. Anymore i would need to knw?

[Q80BOY]

Thanks man really aprrecitate it. My teacher couldnt tell me this stuff when i asked him. Anymore i would need to knw?

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]

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.

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

[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