Answer:
1.5
Step-by-step explanation:
(6,-4)*1.5=(9,-6)
(2,-8)*1.5=(3,-12)
The keyword is "sum" which tells you x, y, and z are being added. One half of the sum means that the sum of the three numbers is going to be divided by 2.
x + y + z
------------
2
9x+12=5x+4
9x-5x=12-4
4x=8
x=8/4
x=2
