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Solving a System of Linear Equations in Two Variables  Problem 9
Alissa Fong
Alissa Fong
MA, Stanford University
Teaching in the San Francisco Bay Area
Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts
For any given system of equations, you have a choice of 3 (or perhaps 4) methods for solving: graphing, substitution, elimination, and maybe matrices, if you've learned them. All methods will work for any given problem you'll get the correct answer  but often one method would be easier than another. In short, use graphing if the lines are already in y = mx+b form and you have a ruler and graph paper handy, use substitution if one of your variables has a coefficient of one, use elimination if the coefficients of one of your variables are additive inverses, and use matrices if you are allowed the use of technology. Always check your solution point by plugging the x and y values back into both original equations.
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Alissa Fong
M.A. in Secondary Mathematics, Stanford University
B.S., Stanford University
Alissa has a quirky sense of humor and a relatable personality that make it easy for students to pay attention and understand the material. She has all the math tips and tricks students are looking for.
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Sample Problems (18)
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