12. Distance between towns. Town B is 5 miles due north of town A, and town C is due east of town A. It is 9 miles from town B to town C. Find the distance from town A to town C, marked b in Figure 9.19.

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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.