That would be 2 numbers. they are 10 and -10.
The answer is: x = 10, y = 2
Leave a thanks because your welcome :)
Work:
x + y = 12
(10) + (2)+ = 12
Correct
x - 2y = 6
(10) - 2(2) = 6
10 - 4 = 6
Correct
The value of x is 23.
Simply find the scale factor or what was used to dilate △MAH to produce △WCF.
Use the equation copy over the original,

Reduce,

So our scale factor is ¼ or 0.25
So if we use it and multiply the corresponding side of the missing side with the original we get,

Therefore 23 is our missing side! !
~~
I hope that helps you out!!
Any more questions, please feel free to ask me and I will gladly help you out!!
~Zoey