It would be a straight line without any ends, going from lower left to upper right
at 45 degrees. It would cross the y-axis 3 units below the origin, and it would
cross the x-axis 3 units to the right of the origin. You can use those two points
to draw the line, and then keep going because the graph of the equation has
no ends.
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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.
3
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.