Solve the system by the substitution method. xy = 20x + y = 9
A. {(-5, 4), (-4, 5)}
B. {(5, 4), (4, 5)}
C. {(5, -4), (4, -5)}
D. {(-5, -4), (-4, -5)}
Answer: B
Mathematics
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The graph of 
is given in the figure. State whether 
or 
A. a < 0 B. a > 0
Mathematics
The (r + 1)st term of the expression (a + b)n, 0 ? r ? n, is given by 
an - rbr. Find the specified term.The 5th term of (x + 2y)14.
A. 16,016x10y4 B. 8008x4y10 C. 16,016x4y10 D. 8008x10y5
Mathematics
Solve the system by the addition method.
A. {(15, -3)}
B. ?
C. {(x, y) 
D. {(-15, 5)}
Mathematics
Find the inverse of the matrix 
(if it exists).
A. does not exist
B. ?
C. ?
D. ?
E. ?
Mathematics