Determining if a function is one-to-one can be done with two methods: the horizontal line test and checking if f(x1) = f(x2) implies x1 = x2. If no horizontal line intersects the graph of the function more than once, it's one-to-one. Alternatively, if each element in the range has exactly one corresponding element in the domain, the function is one-to-one. What specific function are you curious about? I'd love to help you analyze it!