CHMY141 Fall 2014 Lesson 1.1

Direct Proportionality
two quantities that have a constant ratio; expressed as y=x and y=kx where k is a nonzero constant
Inverse Proportionality
two quantities that have a constant product; expressed as y=1/x and xy=k where k is a nonzero constant
Proportionality Constant
the nonzero constant k in the equation that expresses the the relationship between two variables x and y
Algebra
arithmetic in which letters are used to represent variables
Variables
quantities that may have different values
Equation
represents a mathematical relationship among variables
Multiple Proportionalities

when one quantity is proportional to each of two or more other variables, it is proportional to the product of those variables

d=nt, d=knt, k=d/nt