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Solve the system using elimination. 3x + 3y = –9 3x – 3y = 21

A. (–5, 2)

B. (3, –6)

C. (2, –5)

D. (3, 3)

Respuesta :

3x + 3y = –9
3x – 3y = 21
-----------------add
6x = 12
x = 2

3x + 3y = –9 
3(2) + 3y = -9
6 + 3y = -9
3y = -15
y = -5

x = 2 and y = -5

answer: C. (2, –5)

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