Algebra defines, roughly, relationships. See: http://blog.ruofeidu.com/gradient-circulation-laplacian-divergence-jacobian-hessian-trace/ Matrix Form for Linear Regression For the regression model $$Y = AX + B$$, the coefficients of the least squares regression line are given by the matrix equation $$A = (X^T X)^{-1} X^T Y$$ and … Continued