Answer: (Maybe not all of them, but for #1)
= 5
Explanation:
first, since x equals 1/2, you would multiply -2/1 with 1/2 which is -2/2.
then. multiply -2/2 with -5/1 because y is -5. That will result to 10/2 which can then be simplified to 5/1 or just 5