The point that moves (if none a new point is made) goes up or down the graph.
Up is a positive number.
Down is a negative number.
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This question cannot be answered because there is no graph to tell where the y-intercept is.
y = -4x The y-intercept is zero. That is, the graph passes through the origin.
It is called the y intercept
Where a line crosses the y an x axis on a graph.
The function y = -1 has no x-intercept; its graph is a horizontal line with a y-intercept of -1.