It is the point of origin of the x and y axes of the graph
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If you mean: 2x+4y = 4 then the graph joins the points: (2, 0) and (0, 1)
On the Cartesian plane it is at point of origin whose coordinate is (0, 0)
When x = 0, the point that has (0, y) coordinates will be on the y-axis for any y.
If you mean y = -2x-6 then y intersect the graph at (0, -6)
What do you mean by "top of the graph"? Do you mean the highest value? The top of the graph is called "the top of the graph" There's no term for it.