Solve for both systems 8z+x=85 and z + 4x = 30

Asked by AnneS2 12 years ago 7/22/2013 5:10 AM

Last updated by anonymous 12 years ago 7/23/2013 8:28 PM

Answered by CherieS 12 years ago 7/23/2013 8:28 PM

z + 4x = 30

z + 4x-4x = 30-4x

z= 30-4x

8z+x=85

8(30-4x)+x=85

8(30) (8)(-4x)+x=85

240-32x+x=85

240-31x=85

240-31x-240=85-240

-31x=-155

-31x/-31=-155/-31

x=5

z= 30-4x z= 30-4(5) z= 30-20=10