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chapter one • the nature and method of economics might be less at each ticket price. To see this, redraw Figure A1-2, assuming that 2000 fewer fans attend IU games at each ticket price. (Key Appendix Question 2)

SLOPE OF A LINE The ratio of the vertical change (the rise or fall) to the horizontal change (the run) between any two points on a line. The slope of an upward sloping line is positive, reflecting a direct relationship between two variables; the slope of a downward sloping line is negative, reflecting an inverse relationship between two variables.

Slope of a Line

Lines can be described in terms of their slopes and their intercepts. The slope of a straight line is the ratio of the vertical change (the rise or drop) to the horizontal change (the run) between any two points of the line, or rise over run.

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