Answer with Step-by-step explanation:
A function is a map from non empty set a to non empty set B such that corresponding to each element of A there exist unique image in B.
A) y=5
Corresponding to each x, there exist a unique element of each element which is 5
Hence, it is a function
B) x= -2
Corresponding to the point -2, there exist more than one image
Hence, it is not a function
C) y=2x-5
Corresponding to each x,the value of y is unique
Hence,it is a function
D) 2y=x-4
Corresponding to each x,the value of y is unique
Hence,it is a function
Hence, Correct options are:
A) y=5
C) y=2x-5
D) 2y=x-4
