Solve for both systems: 8x+7z=127 and -8x + 9z = 145

8x+7z=127

8x-8x+7z=127-8x

7z=127-8x

7z/7=127-8x /7

z=18.1-1.1x

-8x + 9z = 145

-8x + 9(18.1-1.1x) = 145

-8x + 9(18.1) (9)(-1.1x) = 145

-8x+163-10x=145

163-18x=145

163-163-18x=145-163

-18x=-18

-18x/-18=-18/-18

x=1

z=18.1-1.1x

z=18.1-1.1(1)

z=18.1-1.1=17