w = 4 and YZ=24
1) XY = 4w
YZ= 6w
XZ=12w-8
2) Let's draw this to better understand it
So using the Segment Addition Postulate principle, let's write and solve
12w-8 =4w+6w
12w-8=10w
12w-10w -8=10w-10w
2w-8=0
2w-8+8=8
2w=8
w=4
3) The value for YZ =
6w => 6(4) YZ =24