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When you have an 'x' coordinate and a 'y' coordinate,
you have the location of one definite point.
Your point (3, 3) is located 3 units to the right of the origin,
and 3 units down from the x-axis.
if this is an x,y plot, it would be a vertical line at x = -3
Yes, x = -3 would represent a vertical line at abscissa -3, parallel to the y-axis.
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So this would be a verticle line which passes through the point at -3.
If x equals a constant number, the graph will be a vertical line. For example, the graph of x = 5 would be a vertical line that goes through the point (5,0). x equals 5 on every point along this lines.