The answer to the last problem in Math III today is ( - 3, 7 ).
Here is a link to some instruction on Cramer's Rule, if you would like to see more about it:
http://www.coolmath.com/algebra/14-determinants-cramers-rule/01-determinants-cramers-rule-2x2-01.htm
Here's some practice with determinants and Cramer's Rule. I wouldn't go past # 17.:
http://hotmath.com/help/gt/genericalg2/section_4_3.html
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