If possible, solve the system of equations. Use any method. If there is not a unique solution to a system, say why.
x + 
y = 3
x - 
y = - 
A. No solution; inconsistent system of equations
B. (1, 8)
C. (2, 7)
D. (-2, 8)
Answer: C
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Use the basic trigonometric identities and the given information to find the exact values of the remaining trigonometric functions.cos ? = 
and sin ? = - 
A. sin ? = - 
cos ? = 
tan ? = - 
csc ? = - 
sec ? = 
cot ? = - 
B. sin ? = - 
cos ? = 
tan ? = - 
csc ? = 
sec ? = - 
cot ? = - 
C. sin ? = - 
cos ? = 
tan ? = - 
csc ? = - 
sec ? = 
cot ? = - 
D. sin ? = - 
cos ? = 
tan ? = - 
csc ? = - 
sec ? = 
cot ? = - 
Find the directrices of the hyperbola. 
- 
= 1
A. y = -6 ± 
B. y = -6 ± 
C. y = ± 
D. x = 7 ± 
Match the equation to its graph.x2 = -6y
A. 
B. 
C. 
D. 
Solve the problem.An exam consists of 9 multiple-choice questions and 6 essay questions. If the student must answer 5 of the multiple-choice questions and 3 of the essay questions, in how many ways can the questions be chosen?
A. 810 B. 261,273,600 C. 1,814,400 D. 2520