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Tag: systems of equations

linear algebra, math

Math: Solving systems of equations: Cramer’s Rule

Jack Dec 16, 2014 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

Math: Systems of equations: a word problem

Jack Jan 23, 2014 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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