X = -1
The graph of this equation is a vertical line, passing through the point [ x = -1 ] on
the x-axis. It's parallel to the y-axis, and extends to infinity in both directions ...
up, through Quadrant II, and down, through Quadrant III.
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Y is undefined because the line x=1 never crosses the y axis.
It is a straight line equation.
The slope is 1.
Any line with a slope of 1 is parallel to y=x-3.
After solving for y you will get y=1/5 x+1. The slope of this line is 1/5.