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 Saturday 13th of July

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 Depdendent Variable

 Number of equations to solve: 23456789
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 Dependent Variable

 Number of inequalities to solve: 23456789
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# Horizontal and Vertical Lines

The graph of a linear equation, Ax + By = C, where A and B are not both 0, is a straight line.

â€¢ If A = 0, then the graph is a horizontal line.

For example, y = 3 is a horizontal line. On this line, the y-coordinate is always 3.

â€¢ If B = 0, then the graph is a vertical line.

For example, x = 5 is a vertical line. On this line, the x-coordinate is always 5.

Example 1

Graph the following linear equations:

a. y = 4

b. x = 4

Solution

 a. The graph of y = 4 is a horizontal line. On this line, the y-coordinate is always 4. The y-intercept is (0, 4); the line has no x-intercept. b. The graph of x = 4 is a vertical line. On this line, the x-coordinate is always 4. The x-intercept is (4, 0); the line has no y-intercept.