The transformation represented by 2 x 2 matrix [b]Q [/b], is reflected in the line y=x, can you write down the matrix [b]Q[/b] ?
The transformation represented by 2 x 2 matrix [b]R[/b] , is a rotation of 180° about the point (0,0), can you write down the matrix [b]R[/b]?
Can you find the invariant lines of transformation matrix [b]Q[/b] and [b]R[/b] respectively?