Question 177649
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Your equation has no "y" variable, hence any value of y will satisfy the equation so long as *[tex \huge 3x + 9 = 0 \text { } \Rightarrow \text { } x = -3]


This means that the slope of the line is undefined, and the equation is of a vertical line.


Any line parallel to *[tex \huge x = -3] must also be a vertical line and have an undefined slope.  This would be represented by an equation in x only, such as *[tex \huge x = a]

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