Question

Select all the lines that represent functions

Answer 1

Answer:

B, C, D are functions

Step-by-step explanation:

Functions are those that do not share an x value.  Look at A.  x-values are used twice everywhere except the vertex.  This is not a function, it is just a relation.  B does not at any time share x-values, so this is a function.  C is also a function, and so is D.  F is a vertical line that shares the same x value throughout the whole line, so this is definitely not a function.