Solve the system by substitution. If the system is inconsistent and has no solution, state this. If the system is dependent, write the form of the solution for any real number x.
x + 
y = 4
x - 2y = 21
A. (-6, 8)
B. Inconsistent, ?
C. Dependent, 
D. (6, -8)
Answer: D
Mathematics
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B. 
C. 
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Answer the question about the given function.Given the function f(x) = 
, what is the domain of f?
A. {x|x ? 
}
B. {x|x ? -9}
C. {x|x ? 8}
D. {x|x ? 9}
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A. 
B. 
C. 
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A. 
B. - 
C. 
D. - 
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