ALGEBRA???????????????????????????????

Brooklyn: ALGEBRA???????????????????????????????
use elimination
3x+3y=-9
3x-3y=21
-5,2
2,-5
3,3
3,-6

Answers and Views:

Answer by Steven 2.0
6x=12
6/6=12/6
x=2

Answer by Unknown
You subtract the second equation from the first:

(3x – 3x) + (3y + 3y) = -9 – 21
6y = -30
y = -5

Now substitute -5 for y in one of the equations:

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

So, it’s

2,-5

Answer by zhel321
This one is quite simple: Add the x’s and the y’s.
6x=12
x=2

Plug that into the first one:
3*2+3y=-9
6+3y=-9
3y=-15
y=-5

Answer: [2,-5].

Answer by Lee
3x+3y=-9
3x-3y=21

Add one equation to the other

6x=12
x=2

Insert x into one or both equations:

3x+3y=-9

6+3y=-9

3y=-9-6

3y=-15
y=-5

x=2,y=-5

Answer by kh rocker princess
y=-5

x=2