The augmented matrix is in row-echelon form and represents a system of linear equations. Solve the system using backward substitution.
Write the solution as an ordered triple, if possible.
A. (2 + 6z, -5 - 2z, z) 
B. (2 - z, -5 + z, z) 
C. (2, -5, z) 
D. (2 - 6z, -5 + 2z, z) 
Answer: D
Mathematics
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B. 2 cos 14?
C. 
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A. 
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Evaluate.
÷ 
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