Question

Select all the correct answers. Which of these relations are functions?
A) y=5.
B) x=-2.
C) y=2x-5.
D) 2y=x-4

Answer 1

the answer is A C D your answer

Answer 2

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