Often you will find that linear equations first need to be
simplified before you can solve them . Typically this will involve combining like
terms . Combine same side like terms first then opposite side like terms using
the techniques we learned in part I.
Caution: A common error is to add or subtract a
term on the same side of the equal sign . Only use the opposite operation on
opposite sides of the equal sign.
Not all equations work out to have a single solution. Some
have infinitely many solutions such as. Here any number you choose for x will
work. Also, some equations have no solution such as x + 1=x.
Contradiction – an equation that will always be
false has no solution.
Identity – an equation that will always be true
has any real number ,R, as a solution.
It is quite common to encounter linear equations that
require you to distribute before combining like terms. Look for the parenthesis
and distribute before you do anything.
Literal equations are difficult for many people because
there will be more than one variable . Just remember that the letters are
placeholders for some number so the steps for solving are the same. Isolate the
variable that it asks you to solve for.
The internet connection at the hotel cost $5.00 to log on
and $0.20 a minute to run. If Joe’s total bill came to $18.00 how many
minutes did Joe spend on the internet? (Set up an algebraic equation and