It is the line that cuts through the y axis
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The function y = -1 has no x-intercept; its graph is a horizontal line with a y-intercept of -1.
A vertical line on a graph has infinite slope and no y-intercept. Its equation is [ x = a number ]. The number is the line's x-intercept.
Where a line crosses the y an x axis on a graph.
The y intercept
The place on a graph were a line crosses the y axis