Question 1171988
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<pre>

Let x = daily wage of a saleslady and let y be daily wage of a supervisor.


Then from the condition you have this system of 2 equations in 2 unknown


    12x + 3y = 7020    (1)

    11x + 4y = 7110    (2)


To answer the problem's question, I will apply the determinant method (= the Cramer's rule)


    x = {{{(7020*4 - 7110*3)/(12*4 - 11*3)}}} = 450.



<U>ANSWER</U>.  The daily wage of a saleslady is 450 monetary units.
</pre>

Solved.


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On the Determinants' method for solving the systems of two linear equations in two unknowns see the lessons 

&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.


Also, &nbsp;you have this free of charge online textbook in ALGEBRA-I in this site

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson>ALGEBRA-I - YOUR ONLINE TEXTBOOK</A>.


The referred lesson is the part of this online textbook under the topic "<U>Systems of two linear equations in two unknowns</U>".



Save the link to this online textbook together with its description


Free of charge online textbook in ALGEBRA-I
https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson


to your archive and use it when it is needed.