Question

Which set of ordered pairs represents a function?

{(0, 0), (2, 3), (1, -4), (2, -2)}


{(5, 6), (2, 6), (-3, 4), (-1, 4)}


{(3, -2), (-4, -1), (0, 3), (0, 5)}


{(-5, 1), (-4, 2), (-5, 3), (-4, 4)}

Answer 1

The second one because for every x value there is one and only one y value. If you plotted the points and graphed it, you would know it is not a function if it doesn't pass the vertical line test. Notice the same x values show up repeatedly in the other ordered pairs with different y values. Only one y value for every x value