Question

Determine which relation is a function
{(–5, 1), (–5, 0), (–2, 1), (–1, 4), (6, 2)} {(–5, 1), (–2, 0), (–2, 2), (3, 4), (6, 2)} {(–5, 1), (–2, 0), (–1, 1), (2, 4), (6, 3)} {(–5, 3), (–2, 0), (–1, 2), (6, 4), (6, 3)}

Answer 1

Solve by graphing each set of coordinates and applying the vertical line test. If a vertical line intersects two or more points, then it is not a function.

Solve by looking at the x values in each set of coordinates. If you see two or more coordinates with the same x value and the y values are different, then it is not a function.

Set one is not a function because there are two coordinates with the same x value with different y values. (-5,1), (-5,0)