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Solving a Linear System in Three Variables with a Solution  Problem 3
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
The easiest way to start substitution is to find a variable that has a coefficient of one. Get that variable isolated in one equation, and substitute the resulting expression into both other equations. You will need to be extremely precise with +,  signs and distributing, but if done correctly, you can use this substitution to turn a 3 x 3 system into a much more approachable 2 x 2 system.
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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.
Sample Problems (4)
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Solving a Linear System in Three Variables with a Solution
Problem 1 8,650 viewsSolve the system:
2x + y − z = 5x + 4y + 2x = 1615x + 6y − 2x = 12 
Solving a Linear System in Three Variables with a Solution
Problem 2 4,728 viewsSolve the system:
4a + 2b − 3c = 6a − 4b + c = 4a + 2c = 2 
Solving a Linear System in Three Variables with a Solution
Problem 3 532 views 
Solving a Linear System in Three Variables with a Solution
Problem 4 533 views
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