That's a horizontal line.
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That would be because all the graphed values of x are 4. So you can plug anything in for Y and it will still be on that vertical line.
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.
No. It represents a horizontal line.
If: x-y = 4 and x-3y = 4 Then by solving the simultaneous equations: x = 4 and y = 0 So the lines intersect at (4, 0) which will be a vertical straight line
y=2 is actually a horizontal line. x=2 is vertical.