Solve for both systems 2x+2z=36 and 2x + 7z = 71

2x+2z=36

2x-2x+2z=36 -2x

2z=36 -2x

2z/2=36 -2x/2

z=18-x

2x + 7z = 71

2x + 7(18-x) = 71

2x + 7(18) (7)(-x) = 71

2x + 126 -7x= 71

126 -5x= 71

126 -5x-126= 71-126

-5x=-55

-5x/-5=-55/-5

x=11

z=18-x

z=18-11=7