How does the author determine what the first equation should be

How does the author determine what the first equation should be

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How does the author determine what the first equation should be? The information in the first example is referring to a “total value” equation. It is laying out the format for this by asking for example; “x+y= a given sum” in the equation. In this case x is p and y is q, “p+q=63”. This creates our first row on our
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Unformatted text preview: table then we put in the cost per item on the second row $4.15 and $1.50 from there we get all the information for the third row. 4.15p + 1.50q = 63 where our second equation comes from....
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