Question

If AD = y + 6 and DC = 2y, what is the length of DC? 12 -12 -15 15

Answer 1

y+6=2y
-y=-6
y=6
The length of DC is 12

Answer 2

Answer:

$DC=12\ units$

Step-by-step explanation:

Step 1

Find the value of y

In this problem we know that

$AD=DC$ -----> equation A

$ED=DB$

see the attached figure to better understand the problem

so

we have

$AD=y+6$

$DC=2y$

substitute the values in the equation A

$y+6=2y$

solve for y

$2y-y=6$

$y=6\ units$

Step 2

Find the value of DC

we have that

$DC=2y$

substitute the value of y

$DC=2(6)=12\ units$