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[help] Math paper 4's questions

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