Solve the system using elimination.

3x + 3y = –9
3x – 3y = 21
A. (3, –6)

B. (–5, 2)

C. (3, 3)

D. (2, –5)

Question

Solve the system using elimination. 

3x + 3y = –9 
3x – 3y = 21 
 A. (3, –6)  
 
 B. (–5, 2)  
 
 C. (3, 3)  
 
 D. (2, –5)

anonymous · Answer

add to eliminate y
solve for x 
then replace this value of x in the forst equation to find y

campbell_st · Answer

add the 2 equations to eliminate y

3x + 3y = -9
3x - 3y = 21
------------
6x = 12

x = 2

substitute in either equation to find 

y = -5

ordered pair is (2, -5)

anonymous · Answer

so the answer is D right

anonymous · Answer

yes

anonymous · Answer

thanks can you help me with another one?