Question

HELP please explain to me how to get this.
Which of the following represents a function?

Answer 1

option A : graph is a function

Explanation:

(a) option is given is a graph

For graph , the function should pass vertical line test

Draw vertical line for every value of x

The vertical lines cross only one red point at a time

So the graph is a function

(b) When each input has only one output then it is a function

in option B , input 3 has two output -5 and 0

so it is not a function

(c) in option C , input 3 has two output 14 and 19

so it is not a function

(d) in option d , input -1 has two output -11 and 5

so it is not a function