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# Chapter 3 Math Vocab

TermDefinition
ratio A comparison of two quantities using division. The ratio of a to b (where b does not equal 0) can be written as a to b, a : b, or a/b.
rate a ratio of two quantities with different units.
unit rate A rate with a denominator of 1.
slope A ratio of the change in y (the rise) to the change in x (the run) between any two points on a line. It is a measure of the steepness of a line.
proportion An equation stating that two ratios are equivalent.
proportional Two quantities that form a proportion.
cross products In the proportion a/b = c/d, where b and d do not equal 0, the products a(d) and b(c) are these.
U.S. customary system System of measurement that contains units for length, capacity, and weight.
metric system Decimal system of measurement, based on powers of 10, that contains units for length, capacity, and mass.
direct variation Two quantities x and y show direct variation when y = kx, where k is a number and k does not equal 0.
inverse variation Two quantities x and y show inverse variation when y = k/x, where k is a number and k does not equal 0.
Created by: S730503