Ch 2 vocab Flashcards
solution of an equation
a value of the variable that makes the equation equal
Equation
A mathematical statement that two expressions are equal
formula
an equation that states a rule for a relationship among quantities
literal equation
an equation with two or more variables; use inverse operations
ratio
a comparison of two quantities by division
proportion
a statement that two ratios are equivalent
rate
a ratio of two quantities with different values
unit rate
a rate with a second quantity of 1 unit
conversion factor
a rate in which two quantities are equal but use different units
cross products
use to solve proportions
scale
a ratio between two sets of measurements
scale drawing/scale model
uses a scale to represent an object as smaller of larger than the actual object
similar figures
have exactly the same shape but not necessarily the same size
corresponding sides
sides of two figures in the same relative position
corresponding angles
angles in the same relative position
indirect measurement
used to solve a proportion involving similar triangles to find the length that is nor easily measured
scale factor
the multiplier used with the dimensions of a figure to find a similar figure
percent
a ratio that compares a number to 100
commission
money paid to a person or a company for making a sale
interest
the amount of money charged for borrowing money, or the amount of money earned when saving or investing money
principal
the amount borrowed or invested
tip
an amount of money added to a bill for service
sales tax
a percent of an item’s cost
percent change
an increase or decrease given as a percent of the original amount
