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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 17, which means that when x is 0, y is 17. For this question, the y-intercept is not relevant, since 0 year old children cannot run one mile. Example. A biologist wants to study the relationship between the number of trees x per acre and the number of birds y per acre.