Answer:
It is an octagon if and only if it has eight sides.
Step-by-step explanation:
<ABE and <DBC
x = 4c - 18
=> 4c-3 = x+ 15
Subtracting 15 to both sides
=> x = 4c-3-15
=> x = 4c - 18
y= 1/2 is the answer.
-1.9