y= mx + b. M is the slope of the line, when b is where the line intercepts the y axis.
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No. It represents a horizontal line.
x = -3 represents a vertical line whose slope is undefined.
Any vertical line has an undefined slope. The equation of the vertical line is x = a where the x-intercept is a.
There is no y-intercept or slope for this given equation, because its graph is a vertical line perpendicular to the x-axis.
It is a horizontal line in the Cartesian plane, or a vertical line in the complex plane. The reason is that these points satisfy the equation while no others do.