###### Exercise5

Describe geometric effect that the following matrices have on $$\real^2\text{:}$$

1. $$A = \left[\begin{array}{rr} 2 \amp 0 \\ 0 \amp 2 \\ \end{array}\right]$$

2. $$A = \left[\begin{array}{rr} 4 \amp 2 \\ 0 \amp 4 \\ \end{array}\right]$$

3. $$A = \left[\begin{array}{rr} 3 \amp -6 \\ 6 \amp 3 \\ \end{array}\right]$$

4. $$A = \left[\begin{array}{rr} 4 \amp 0 \\ 0 \amp -2 \\ \end{array}\right]$$

5. $$A = \left[\begin{array}{rr} 1 \amp 3 \\ 3 \amp 1 \\ \end{array}\right]$$

in-context