Solve the system by the addition method.
x2 - 3y2 = 1
3x2 + 3y2 = 15
Answer choices:
A. {( 1, 2), ( -1, 2), ( 1, -2), ( -1, -2)}
B. {( 1, 2), ( -1, -2)}
C. {( 2, 1), ( -2, 1), ( 2, -1), ( -2, -1)}
D. {( 2, 1), ( -2, -1)}

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My guess is D but i'm not 100%

or maybe c

You need to add the two equations together and then simplify the answer.

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