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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 intercept is theyvalue when xequals zero, which is 1.0 in the example. Be sure to look carefullyat the x-axis scale; if it does not start at zero, you might read o the interceptincorrectly. The slope is the change in yfor a one-unit change in x. Because theline is straight, you can read this o anywhere.