5. Find the value of x that makes BC || DE.

Answer:
x = -7
Step-by-step explanation:
To find the value of x, you need to set up a proportion:
[tex]\frac{x-2}{15}[/tex] = [tex]\frac{x-1}{18}[/tex]
Then cross multiply:
15x - 15 = 18x + 36
Then subtract 15x from both sides:
-15 = 3x + 36
Subtract 36 from both sides:
-51 = 3x
Finally, divide both sides by 3:
x = -7