SOLUTION: I can not find guidance on solving systems of linear equations with three variables. Please help! x+y+z=13 10x+12y+7z=129

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Question 368943: I can not find guidance on solving systems of linear equations with three variables. Please help!
x+y+z=13 10x+12y+7z=129
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
You need three equations to solve for three unknowns.
Do you have another equation?