Answer:
C.6
Explanation:
12x=8
x=8/12=2/3
2/3*9=18/3=6
Option C
We can see that these two triangles are similar triangles. And based on the sides we also know triangle ZXY and triangle FDE have a ratio of 3:2. We can find side x by the equation:
3:2=9:x
3x=18
x=6 or option C
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