


Description 



Equation: A mathematical sentence that contains an equals sign. 
Suppose each audio CD costs $12.00 at a certain store. Let's
write an equation to determine the total cost (without tax) for the number of
CDs you want to purchase.
c = 12n
c is a variable representing the
total cost and n is the variable representing the number of
CDs purchased. The number 12 is the coefficient of n. If you bought 1 CD,
then the total cost is $12.00. If you bought 3 CDs, then the total cost is
$36.00. Note that the variables may represent more than one amount.
In the equation t = 5 + n, the coefficient of
n is 1 and NOT 5 because 5 is being added to n and not being
multiplied by n.


