Question 1169155
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"Use a matrix approach" means to me one of three possibilities:
A graphing calculator;
Gauss-Jordan elimination;
Cramer's Rule.<br>
All three of those methods are well defined.  It does you no good to have us do the work for you and tell you the answer; and it uses a lot of our valuable time.<br>
Choose a method (the graphing calculator is by far the easiest!) and work the problem yourself.<br>