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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 x-and y-intercepts of a graph. The relationship between the roots and the x-intercepts. 1 8. The slope of a straight line. Definition of the slope. Positive and negative slope. A straight line has only one slope. Same slope and parallel.. Perpendicular lines. The slope and one point specify a straight line.