y=2 is actually a horizontal line. x=2 is vertical.
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That's a horizontal line.
y= mx + b. M is the slope of the line, when b is where the line intercepts the y axis.
Every point on the line has coordinates of the form (4, y) for different values of y. On a standrad coordinate graph, this will appear as a vertical line.
The slope is infinite because x = 2/3, a vertical line, for all values of y.
x = -2 is a vertical line, two units to the left of the y-axis.