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# Grade 8 Chapter 2

### Equations

commission Money paid to a person or company for making a sale, usually a percent of the sale amount.
contradiction An equation that has no solutions.
conversion factor The ratio of two equal quantities, each measured in different units.
corresponding angles Angles in the same position in two different polygons that have the same number of angles.
corresponding sides Sides in the same position in two different polygons that have the same number of sides.
cross products In the statement a/b = c/d, bc and ad are the cross products.
discount An amount by which an original price is reduced.
equation A mathematical statement that two expressions are equivalent.
formula A literal equation that states a rule for a relationship among quantities.
identity An equation that is true for all values of the variables.
indirect measurement A method of measurement that uses formulas, similar figures, and/or proportions.
interest The amount of money charged fro borrowing money or the amount of money earned when saving or investing money.
literal equation An equation that contains two or more variables.
markup The amount by which a wholesale cost is increased.
percent A ratio that compares a number to 100.
percent change An increase or decrease given as a percent of the original amount.
percent decrease A decrease given as a percent of the original amount.
percent increase An increase given as a percent of the original amount.
principal An amount of money borrowed or invested.
proportion A statement that two ratios are equal.
rate A ratio that compares two quantities measured in different units.
ratio A comparison of two quantities by division.
sales tax A percent of the cost of an item that is charged by governments to raise money.
scale The ratio between two corresponding measurements.
scale drawing A drawing that uses a scale to represent an object as smaller or larger than the actual object.
scale factor The multiplier used on each dimension to change one figure into a similar figure.
scale model A three-dimensional model that uses a scale to represent an object as smaller or larger than the actual object.
similar Two figures are similar if they have the same shape but not necessarily the same size.
solution of an equation A value of the variable that makes the equation true.
tip An amount of money added to a bill for service; usually a percent of the bill.
unit rate A rate in which the second quantity in the comparison is one unit.
Created by: bookannelid