[help] Math paper 4's questions

[henry407]

Does anyone remember the question about shearing, it is Shear about y-axis invariant, or Shear about X-axis invariant?? I wrote the matrix as ( 1 0 -1 1)Left to right, Top to bottom.

 

[henry407]

help help help !!!!!!

 

[HorsePower]

shear was X invarient, and stretch was Y invarient and the matrix was (4 0 0 1) for stretch

 

[henry407]

Oh our paper is totally different, I took the exam in hong kong..

 

[HorsePower]

the answers may differ , depending on which varient u gave :wink:

 

[dancingmaster]

Oh damn. I got the matrix wrong. HOw do you know it was ( 4 0 0 1)? I do not get these things.

 

[henry407]

I double checked with my classmate, I make sure that most of my answers were correct, except that ... I hope I am right , I want to get an A*

 

[HorsePower]

who doesnt want to get A*

@ dancingmaster : i memorized the different transformation matrices for each type of transformation. The matrice for stretch with Y-axis invarient is ( k 0 0 1 ) where k= scale factor. the scale factor in the question was 4, so we get ( 4 0 0 1 ).

 

[Dooouuu]

so what about the last question ??... sequence >>?? what was ur answers ?