Solve for both systems 7x+13z=209 and 2x + 6z = 94

2x + 6z = 94

2x + 6z-6z = 94-6z

2x= 94-6z

2x/2= 94-6z/2

x=47-3z

7x+13z=209

7(47-3z)+13z=209

7(47) (7)(-3z)+13z=209

329-21z+13z=209

329-8z=209

329-8z-329=209-329

-8z=-120

-8z/-8=-120/-8

z=15

x=47-3z

x=47-3(15)

x=47-45=2