This is called the y-intercept and represents the value of the plotted function at x = 0.
The place where the graph crosses the y axis is called the y intercept.
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It is at point of origin which is at (0, 0)
The y-intercept on the graph shows where the graph crosses the y-axis. The value is always the value of y at that point, because x is always equal to zero.
When the graph of a quadratic crosses the x-axis twice it means that the quadratic has two real roots. If the graph touches the x-axis at one point the quadratic has 1 repeated root. If the graph does not touch nor cross the x-axis, then the quadratic has no real roots, but it does have 2 complex roots.
Whether the graph has 0, 1 or 2 points at which it crosses (touches) the x-axis.
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