Solve for both systems: 9x+4z=165 and 5x + z = 88

5x + z = 88

5x-5x + z = 88-5x

z = 88-5x

9x+4z=165

9x+4(88-5x)=165

9x+4(88) (4)(-5x)=165

9x+352-20x=165

352-11x=165

352-11x-352=165-352

-11x=-187

-11x/-11=-187/-11

x=17

z = 88-5x

z = 88-5(17)

z = 88-85=3