I want to create a 3 year pro-forma return on investment line graph with a clear break even point. Here is the data I have:

x: Annual ROI

y: Total investment

from these two values I calculate the break even point (z) with this calculation where J47 is y and J42 is x

z=INT(J47/J42) & " years " & INT(((J47/J42)-INT(J47/J42))*12) & " months"

So, here are some real numbers

x: 292,500

y: 250,000

z: 10 months

I want to generate a graph with 36 months on the x-axis and $$$ on the y-axis. I haven't played around with this too much yet, but if anyone can help I would appreciate it!