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Tag: systems of equations

Math: Solving systems of equations: Cramer’s Rule

By Jack Posted on December 16, 2014 Posted in linear algebra, math Tagged with cramer's rule, systems of equations

Tutoring high school math, I don’t see this used.  However, I did see it at university.  The tutor introduces Cramer’s Rule. Consider the following problem, common in high school math: Solve the system. 2x-4y=20 3x+5y=-3 If you know determinants (having …

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Math: Systems of equations: a word problem

By Jack Posted on January 23, 2014 Posted in math Tagged with flat fee plus rate charge, substitution, systems of equations

Tutoring math, you revisit this type of problem often.  The math tutor gives a quick reminder just ahead of exams. Here’s the problem: A saleswoman gets paid a base monthly salary plus commission.  One month she sells $50 000 and …

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