Which relation decribes a function

A particular function can be called a relation when for each input to the function there is only one output.

Step-by-step explanation:

A particular function can be called a relation when for each input to the function there is only one output.

A function cannot be called a relation if for each input to the function there may be more than one output.

An example of a relation is f(x) = 3x + 4. Every input to this function will give only one output for example when x = 1 the f(1) = ( 3 × 1) + 4 = 7.

x equals 1

step-by-step explanation:

f(4)=f(×)

x=1

i think the correct option is the second option.