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The y-intercept is the value of the function when 'x' is zero. That is, it's the point at which the graph of the function intercepts (crosses) the y-axis. The x-intercept is the value of 'x' that makes the value of the function zero. That is, it's the point at which 'y' is zero, and the graph of the function intercepts the x-axis.
The function y = -1 has no x-intercept; its graph is a horizontal line with a y-intercept of -1.
It can be casually called the x intercept, but it/they is/are the root(s) of the function represented by the graph
It is the y-coordinate of the intercept (the x-coordinate being 0).
-1