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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.
The y intercept is the value of y when x = 0. The x intercept is the value of x when y = 0. You are absolutely right that in a linear equation's general from y = mx + b, b is the y-intercept. As, y = mx + b is the general form. In order to find the y intercept, u must substitute x = 0.