A vertical line can not be defined by any normal equation, because its range is a single number that gives the x-coordinate and y can have any value whatever.
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The line x = 4 is a verticle line because, in a standard x-y graph, where x increases to the right and y increases upwards, the graph x = 4 is all points y, where x is 4. That is a verticle line, with infinite slope.
Yes the graph of a function can be a vertical or a horizontal line
We usually denote the slope of a line as M. Horizontal lines have a slope of zero. Mhorizontal line = 0 Verticle lines have a slope that is undefined. Note that the slope is not infinite, but is undefined. Mvertical line = undefined To write the equation of a horizontal or vertical line, we need to know if it's going to be a slope-intercept form or a point-slope form.
So this would be a verticle line which passes through the point at -3.
This would be a more meaningful statement if it said that the y intercept of the equation equals 2, which would mean that when you draw the equation on a graph, the line intersects the y axis at 2, or in other words, when x = 0, y = 2. However, as stated, x = 2 has no y intercept. If you graph it, that is just a verticle line located at 2 on the x axis.