maryfitzgerald2019
maryfitzgerald2019 maryfitzgerald2019
  • 03-02-2017
  • Mathematics
contestada

3x + 3y = –9
3x – 3y = 21

Respuesta :

yashddsy26
yashddsy26 yashddsy26
  • 03-02-2017
so solving by addition !

6x= 12
x= 2

and y = -5
Answer Link
juanny1818
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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