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More specifically, 1  an x-intercept is a point in the equation where the y-value is zero, and. 2  a y-intercept is a point in the equation where the x-value is zero.  Find the x- and y-intercepts of 25x2 + 4y2 = 9.
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.