4 years ago

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

1 answer:

8 0

<span>x + 3y = –9
3x – 3y = 21
-------------------add
4x = 12
x = 3

substitute x = 3 into </span>x + 3y = –9
3 + 3y = –9
3y = -12
y = -4

Answer
(3, -4) is the solution of the system.

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