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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.
Calculate the y-intercept of your equation. The y-intercept (or the variable b in our equation) is the point at which the line crosses the y-axis. You can calculate the y-intercept by rearranging the equation to solve for b.