Question

Solve the system using elimination.

3x + 3y = –9
3x – 3y = 21
A. (3, –6)

B. (–5, 2)

C. (3, 3)

D. (2, –5)

Answer 1

Subtract the two equations and tell what you got?

Answer 2

you should just add the two equations
6x = 12
so x = 2

Answer 3

3x + 3y = -9
3x - 3y = 21

Subtract:

6y = -30

Get y from here..

Answer 4

The answer is D.
Plug in 2 for X and -5 for y in each equation.

Answer 5

thank you guys! :)