OutlineforLinearEquationsof2variables

OutlineforLinearEquationsof2variables - Outline for Linear...

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Outline for Linear Equations and Inequalities of 2 variables A 1. Substitute any value for x in the equation and solve for y . This results in a point ( x, y ). OR Substitute any value for y in the equation and solve for x . This results in a point ( x, y ). 2. PLOT a minimum of 2 points (3 preferable) and connect with a line. B 1. To find the x -intercept: Let y equal zero and solve for x . This point ( x , 0) is the x -intercept, where the line crosses the x -axis. 2. To find the y -intercept: Let x equal zero and solve for y . This point (0, y ) is the y -intercept, where the line crosses the y -axis. 3. If x = 0 when y = 0, then the origin is both the x -intercept and the y - intercept. 4. Intercepts are often used as points to help graph a line. C 1. If two points ) , ( 1 1 y x and ) , ( 2 2 y x are known, the slope can be found using the slope formula, 1 2 1 2 x x y y m - - = 2. If the result is # nonzero 0 , the slope is 0. If the result is
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This document was uploaded on 01/21/2012.

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OutlineforLinearEquationsof2variables - Outline for Linear...

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