21.4 The Method of Undetermined Coefficients: Working Back from Points
Point 4 of 5
21.4.4 Recovering the Formula from a Graph
Core idea
Read two clean whole-number points off the picture, substitute them back, and you can reconstruct the line's formula.
Module goal. Master the general technique for recovering y=kx+b from given conditions, opening the reverse route from "graph or data" back to "formula."
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