The chart below summarizes the results of a 5th grade experiment comparing student height to student arm span. Which of the following equations would be a suitable equation for a line of best fit for the data in the chart?

Y=-x I think the answer is y=-x because there isn't really a pattern, it's increasing then decreasing then increasing and decreasing and so on. So if you do find a pattern then it wouldn't be y=-x for sure, but since there is no pattern I'm going for y=-x

Hope that's right