I displayed these d values on the graph for you. Notice that they are the vertical distance from the real data points to the fitting linear function. Why this way?

At the point (or points) where two graphs intersect, the x and y values are the same for both functions. We use this information to find the solution to simultaneous linear equations.

Ever wonder what sorts of errors freshman math students make? There are a couple of pretty basic ones.

We present a generalization of linear systems on graphs where divisors are 𝑅-valued functions on the set of vertices and graph edges are permitted to have nonnegative weights in 𝑅. Using this ...

Journal of the Royal Statistical Society. Series C (Applied Statistics), Vol. 30, No. 2 (1981), pp. 125-131 (7 pages) In generalized linear models each observation is linked with a predicted value ...