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DQ 2
The author determines the first equation (exercise 2), using the “Quantity Equation”. The quantity
equation is the usually the amount of the first item plus the amount of the second item equal to the total
count (x + y= some number). In this case, it is a + b = 16. The first item is x which is Nasturtiums and the
second item is y which is JohnnyJumpUps. The quantity in packets of both should be a total of 16.
In the second equation (exercise 3), the author figures out the first equation using the same
method called the quantity equation. We know that x + y = 16200, and 16200 is her total loan. So what
does x and y mean? The author set it up thinking that the first loan’s amount plus the second loan’s
amount must be 16200. So, x represents the first loan and y represents the second loan. The first loan is
the Perkins Loan and the second loan is the Stafford Loan.
In the third equation (exercise 4), the author figures out the first equation using the same method
called the quantity equation. We know that g + s = 90, and 90 is her total mixture. So what does g and s
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 Spring '09
 mcmillian
 Math

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