Question

Is this

A. A function, but not one-to-one

B. A one-to-one function

C. Not a function

Answer 1

The line does represent a function.

Moreover it's a one to one function because it passes the vertical test (a vertical line intersects the function in ONE and ONLY ONE point, so it's a function.

It's also a one to one function because it passes the HORIZONTAL line testr, so it's a ONE-TO-ONE function since the HORIZONTAL test intersects in one and only one point