Use Cramer's rule to solve the system.-4x - 7y + 2z = -65-2x + 7y + 7z = 80 6x - 7y - 2z = -57
A. {(2, 9, 3)}
B. {(2, -9, -3)}
C. {(9, 3, 9)}
D. {(3, 7, 3)}
Answer: A
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A. 
B. 
C. 
D. 
Find the equation of the least-squares line for the given data. Draw a scatter diagram for the given data and graph the least-squares line.
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A. ?
B. ?
C. ?
D. ?
