Solve the system by substitution. 3x + y = 0-3x + y = -6

A. {(-1, -3)}
B. {(-1, 3)}
C. {(1, 6)}
D. {(1, -3)}

Answer: D

Mathematics

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Express the product as a sum containing only sines or cosines.cos  cos 

A. [cos(3?) + cos(4?)]
B. cos2(7?)
C. [cos(4?) - sin(3?)]
D. [cos(8?) - sin(6?)]

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Approximate the natural logarithm with a scientific calculator. Round to four decimal places.ln 8

A. 2.9520 B. 0.4794 C. 2.0794 D. 0.9031

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Graph the ellipse and label the center. +  = 1

A. C(9, 11)

B. C(-9, 11)

C. C(-9, -11)

D. C(9, -11)

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Graph the equation in the rectangular coordinate system.x = 2

A.

B.

C.

D.

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