4×+5×=what is this questions because i don't know it

it should equal to 1x  

A) No, because one x-value corresponds to two y-values.

Step-by-step explanation:

A function is a relation in which each element of the domain (x) is mapped to only one element of the range (y).  This means if any x is mapped to more than one y (if any x is used more than once) then the relation is not a function.

In this relation, the x-value of 2 is mapped to more than 1 y value; it is mapped to both 1 and 4.  Thus it is not a function.