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3x + 3y = –9 3x – 3y = 21
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2 votes
3x + 3y = –9
3x – 3y = 21

User Harpax
by
7.7k points

2 Answers

3 votes
so solving by addition !

6x= 12
x= 2

and y = -5
User Eason
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8.3k points
2 votes
3x+3y=-9
Add -3y to both sides.3x+3y+−3y=−9+−3y3x=−3y−9
you can divide
3x/3= -3y-9/3
 x= -y-3

3x-3y=21
x=y+7


User Holger Sindbaek
by
8.7k points
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