@rlopez 

Hi rlopex, yes you are correct I found the error (typo) in excel. The intersect is at x=30. Solved.

Thanks Adri,

based on the solution {x = 30.00404568, y = 86.}, {x = 2005.705515, y = 86.},  {x = -35.99639135, y = 86.},

how would I plot the entire graph next ?