To see if it is a reduction or an enlargment we have to check whether the constant multiplying x and/or y is greater than 1 or it's between 1 and 0.
If the transformation is
[tex](x,y)\rightarrow(kx,ky)[/tex]
if |k|>1 then it's an enlargement
if |k|<1 then it's a reduction
Let's see the problem here
1. (0.2x, 0.2y)
0.2 is between 0 and 1, so this is a reduction
2. (5/4x, 5/4y)
5/4 is the same as 1 1/4 or 1.25, so this constant is greater than 1. This is an enlargement
3. (7.5x, 7.5y)
7.5 is greater than 1. This is an enlargement
4. (4/5x, 4/5y)
4/5 is lower than 1, it's 0.8. This is a reduction
