Solve the system mentally, without the use of a calculator or pencil-and-paper calculation. Try to visualize the graphs of both lines.x + 0y = 90x + y = 4
A. x = 9; y = 4
B. x = 4; y = 9
C. x = 9; y = 2
D. x = 2; y = 
Answer: A
Mathematics
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A. 
B. 
C. 
D. 
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A. 
B. 
C. 
D. 
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Factor.y2 - 81
A. (y + 81)(y - 81) B. (y + 9)(y - 9) C. (y - 9)(y - 9) D. (y2 + 9)(y2 - 9)
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Use Cramer's rule to solve the linear system.
A. x = 
, y = 
B. x = - 
, y = 
C. x = 
, y = - 
D. x = 
, y = - 
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