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Graphing Horizontal and Vertical Lines

Graphing Horizontal and Vertical Lines 1.4 - Solution

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a
A horizontal line has a slope of and can be written as follows in slope-intercept form.

In this formula, is the intercept. We are told that our line crosses the axis at so the intercept is Thus, we've found the equation of the line.

b
Equations in slope-intercept form follow a specific format. In this form, represents the slope of the line and th e intercept. We are told that the slope is and the intercept is Therefore, we have that and We can substitute these to obtain the equation of the line.