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" ... Linearity is a mathematical concept that has a few different meanings. At its simplest, it means that you can solve problems using variations off of y=a*x + b. For instance, the relationship between temperatures in Fahrenheit and Celsius is given as C = (5/9) * (F - 32). More generally, it means that you can transform formulas in such a way that the transformed formula has this kind of relationship. Exponential and logarithmic equations are often handled this way, and, if complex numbers (real + imaginary numbers) are used, this also includes trigonometric functions like sines and cosines. ... "