Place the x values (if there are two of the same x value you only include it once) in the first box vertically like: 5 -3 6 2 Place the y values (if there are two of the same y values only include it once) in the 2nd box vertically like: 1.2 7 -3 Now draw lines from your x values to their corresponding y values. A function may NOT have two y-values assigned to the same x-value, but it may have two x-values assigned to the same y-value. So this is a function!
