Solve the system by the method of your choice. Identify systems with no solution and systems with infinitely many solutions, using set notation to express their solution sets.y = 15 - 4x16x + 4y = 60
A. {(0, 15)}
B. {(5, -5)}
C. {(x, y) 
}
D. ?
Answer: C
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Solve the system using substitution.
A. no solution B. (0, -5) C. (0, -4) D. (-1, -4)
The graph of a piecewise-defined function is given. Write a definition for the function. 
A. 
B. 
C. 
D. 
Solve the inequality and give the solution set.|x| < -6
A. ?
B. {x|-6 < x < 6}
C. 
D. {-6}
Solve the system of equations using substitution.
A. x = 2, y = 7; x = 7, y = 2; x = 2, y = -7; x = 7, y = -2 or (2, 7), (7, 2), (2, -7), (7, -2) B. x = 2, y = 7; x = -2, y = -7; x = 2, y = -7; x = -2, y = 7 or (2, 7), (-2, -7), (2, -7), (-2, 7) C. x = -2, y = -7; x = -7, y = -2; x = -2, y = 7; x = -7, y = 2 or (-2, -7), (-7, -2), (-2, 7), (-7, 2) D. x = 2, y = -2; x = -2, y = -7; x = 7, y = 2; x = -7, y = -2 or (2, -2), (-2, -7), (7, 2), (-7, -2)