Question 1196288
.
Olivia bought four composition notebooks and three packs of pencils 
from the school bookstore and paid $10.93. 
Jackie bought seven composition notebooks and two packs of pencils 
and paid $13.31. 
What is the price of a pack of pencils? (Do not include the $ in your answer).
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Solve using the determinant method.


<pre>
Equations:

    4N + 3P = 10.93

    7N + 2P = 13.31

  ----------------------


    P = {{{(4*13.31-7*10.93)/(4*2-7*3)}}} = 1.79.


<U>ANSWER</U>.  A pack of pencils costs 1.79 dollars.
</pre>

Solved.


For such problems, the determinant methos is fastest and most straighforward way to get the answer.


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On the &nbsp;Determinants' method for solving systems of two linear equations in two unknowns see the lesson 

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF =http://www.algebra.com/algebra/homework/coordinate/lessons/Solution-of-the-lin-syst-of-two-eqns-with-two-unknowns-using-det.lesson>Solution of the linear system of two equations in two unknowns using determinant</A> 

in this site.