57. Let f(x) /x (a) If a 0, use Equation 2.7.5 to find f'(a) (b) Show that f'(0) does not exist (c) Show that y (Recall the shape of the graph of f. See Figure 1.2.13.) Vx has a vertical tangent line at (0, 0)

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Equations and Inequations

Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.