PLS HELP!!!If AD = y + 6 and DC = 2y, what is the length of DC?

https://dlap.gradpoint.com/Resz/~yUA6AAAAAAAEqMI831w2zB.nsXjSHYhd9cRJRSC-7kKmB/7234256,F04/Assets/questions/test/geometry/geomeas/mc083-1.jpg

Question

PLS HELP!!!If AD = y + 6 and DC = 2y, what is the length of DC?

https://dlap.gradpoint.com/Resz/~yUA6AAAAAAAEqMI831w2zB.nsXjSHYhd9cRJRSC-7kKmB/7234256,F04/Assets/questions/test/geometry/geomeas/mc083-1.jpg

eviant · Answer

@563blackghost

563blackghost · Answer

It shows in your diagram that AD and DC are both marked with double lines, this means that they are congruent to each other. So they equal each other.

$\bf{AD=DC}$

Plug.

$\bf{y+6=2y}$

What is `y`?

eviant · Answer

6?

563blackghost · Answer

yup.

Now just plug in 6 for `2y`.