Let's set up a system of Equations:

We know

and that which tells us that A and C are congruent.

Now let's substitute: and simplify to

And for our second equation and simplify this to

Now to get x by itself and let's plug it into the first equation simplify and now we get and

Now just put y into the original equation and get . So now we have

Put the values back into the original problems to see if they are true and you are done.