Solve for both systems: 10x+z=31 and 9x + 2z = 40

Asked by AnneS2 on 13 Oct 06:34

Last updated by anonymous on 14 Oct 11:06

Answered by CherieS on 14 Oct 11:06

10x+z=31

10x-10x+z=31-10x

z=31-10x

9x + 2z = 40

9x + 2(31-10x) = 40

9x + 2(31) (2)(-10x) = 40

9x + 62-20x = 40

62-11x = 40

62-11x -62= 40-62

-11x=-22

-11x/-11=-22/-11

x=2

z=31-10x

z=31-10(2)

z=31-20=11