The graph should contain only straight lines but it gets tricky at the y-axis. For all negative x-values, you would make them positive (the negative of a negative number is positive. For example, -3 as a value for x would simply be 3 on the y-axis). However, once you cross the y-axis, the values for x are now positive and the positive of a negative is still negative. In other words, your x values are now all positive but your y values will be negative. The graph would increase up to the origin when on the left of the y-axis, and then decrease after you cross the axis. It should resemble an upside down “V” and the rate of change, or the slope, will always be 1.