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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.
Your tutorials are good and you have a personality as well. I hope you have more advanced college level stuff, because I like the way you teach.”
Thanks alot for such great lectures... I never found learning this easier ever before... keep up the great work.... :)”
You seem so kind, it's awesome. Easier to learn from people who seem to be rooting for ya!' thanks”
Sample Problems (4)
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Solving a Linear System in Three Variables with a Solution
Problem 1 8,392 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 4,551 viewsSolve the system:
4a + 2b − 3c = 6a − 4b + c = 4a + 2c = 2 
Solving a Linear System in Three Variables with a Solution
Problem 3 445 views 
Solving a Linear System in Three Variables with a Solution
Problem 4 441 views
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