Michelle was attempting to estimate a model for her small business's overhead costs. She is 99.9% sure that overhead costs are driven primarily by production, but she also knows that this cost isn't entirely variable. So she grabbed the last 8 months of production and overhead cost data, listed it out, and plotted it as follows. (a) (b) Help Michelle estimate her company's overhead costs using the high-low method. Write your final model in Y=m(X)+b format. Y=$