IA, Ch 2: Equations

18 terms by IntAlg 

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Addition Property

If a=b, then a+c=b+c, so you can add 2 sides of an equation by the same number

Multiplication Property

If a=b, then ac=bc, so you can multiply 2 sides of an equation by the same number

Identity Property of Addition

a + 0 = a

Identity Property of Multiplication

a * 1 = a

Cross Products Property

multiply across both ways, the answers are equal

reciprocal

a pair of numbers whose product is 1: the reciprocal of 2/3 is 3/2

literal equation

an equation with mostly/all variables such as a formula

unit rate

a rate that has a denominator of 1 used to compare different rates

conversion

changing the unit of measurement, ex: changing from inches to yards

proportion

two equal fractions

similar

shapes with the same angles but different sizes (use proportions to solve)

map scale

shows the ratio between distances on a map and actual distances

percent proportion

for finding the percent of a number: part/base=%/100. is->part, of->base, percent->%

simple interest

extra money earned/owed for loaning/borrowing money. I = prt

principle

the starting amount borrowed or loaned

rate

(1) a ratio that compares two quantities measured in different units, (2) the percent earned in interest

percent of change

the percent a quantity increases or decreases from its original amount, use the percent proportion then add/subtract

relative error

ratio of errror in measurement to the approximate measurement: (measured-actual) ÷ actual

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