Solve by the substitution method. x + 4y = 167x + 5y = 20
A. {(-4, 0)}
B. ?
C. {(1, 3)}
D. {(0, 4)}
Answer: D
Mathematics
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A. Yes B. No
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, 
< ? < ? and sin ? = - 
, ? < ? < 
, find the exact value of tan (? + ?).
A. 
B. 
C. 
D. 
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A. 32 B. 28 C. 8 D. 10
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