In this case, we'll have to carry out several steps to find the solution.
tep 01:
Data
scale factor of dilation = -1/2
(-0,2) ===> ?
(-4,2) ===> ?
Step 02:
scale factor of dilation = -1/2
(-0 , 2)

(-4 , 2)

The answer is:
(-0,2) ===> ( 0 , -1)
(-4,2) ===> (2 , -1)