4x+6z=114
4x+6z-6z=114-6z
4x=114-6z
4x/4=114-6z/4
x=28.5-1.5z
7x + 4z = 141
7(28.5-1.5z) + 4z = 141
7(28.5) (7)(-1.5z) + 4z = 141
199.5-10.5z+ 4z = 141
199.5-6.5z= 141
199.5-6.5z-199.5= 141-199.5
-6.6z=-58.5
-6.6z/-6.6=-58.5/-6.6
z=8.86
x=28.5-1.5z
x=28.5-1.5(8.86)
x=28.5-13.29=15.21