In the addition/subtraction method, the two equations in the system are
added or subtracted to create a new equation with only one variable. In
order for the new equation to have only one variable, the other variable
must cancel out. In other words, we must first perform operations on
each equation until one term has an equal and opposite coefficient as
the corresponding term in the other equation.
The queen size mattress has a catalog price of 428.99 dollars. NOw, it has a trade discount rate or 20% => 20% / 100% = .20 Next is to do the solution: => 428.99 * .20 = 85.798 dollars or 85.80 Now, let's find out the net price: => 428.99 - 85.80 = 343.19 dollars or 343.2.
