4x + 3y = 37 and - 4x + 4y = - 16

Asked by AnneS2 12 years ago 5/30/2013 4:55 AM

Last updated by anonymous 12 years ago 5/31/2013 1:07 PM

Answered by CherieS 12 years ago 5/31/2013 1:07 PM

- 4x + 4y = - 16

- 4x + 4y+4x = - 16+4x

4y=- 16+4x

4y/4=- 16/4+4x/4

y=-4+x

4x + 3y = 37

4x + 3(-4+x) = 37

4x + (3)(-4) (3)(+x) = 37

4x-12+3x=37

7x-12=37

7x-12+12=37+12

7x=49

7x/7=49/7

x=7

y=-4+x

y=-4+7

y=3