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 pair, if possible.
A. (2, 9)
B. No solution
C. (9, -3)
D. (-3, 9)
Answer: B
Mathematics
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, 0 < ? < 
; cos ? = 
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Find cos (? + ?).
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