Algebra.Com's Answer #94813 by solver91311(24713)![\"\"](\"/images/stars/stars-13.gif\")  
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Horizontal lines have points where the y-coordinates are identical for every point in the line, and the x-coordinates can be any real number. They also have a zero slope, so  makes sense. Since all of the points have the same y-coordinate, the y-intercept must be (0,7), and then the equation would be  , or just  \r
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document.write( "Vertical lines are unique in that the slope is undefined, so doesn't make any sense. However, vertical lines are similar to horizontal lines except that it is the x-coordinate that remains constant and the y-coordinate can be any real number. So the equation is  , which is another way of saying, \"I don't care what y is, as long as x is -3.\" Of course, you could make a similar descriptive statement for your vertical line.\r
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document.write( "Both of these equations are in standard form, because standard form is  . In the case of the horizontal line, A = 0, B = 1, and C = 7. In the case of your vertical line, A = 1, B = 0, and C = -3, and the terms with 0 coefficients simply go away, although you could actually write them out like so:\r
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document.write( "For your vertical line:  . However, that is trivial silliness. \n" );
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