maryfitzgerald2019 maryfitzgerald2019

03-02-2017
Mathematics

contestada

3x + 3y = –9
3x – 3y = 21

Respuesta :

yashddsy26 yashddsy26

03-02-2017

so solving by addition !

6x= 12
x= 2

and y = -5

Answer Link

juanny1818 juanny1818

03-02-2017

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

Answer Link

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