Prove that the two circles are shown below are similar. Explain answer

The two circles are the same shape but circle X is larger by a factor of two.
Therefore circle Y is half the size of circle X
proof:
circle x has a diameter of 12
circle y has a diameter of 6
12/6=2 (factor of 2)
circle x: R=6
circle y: R= 3
again, 6/3 = 2 (factor of 2)

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|3x+5|+2=4   
|6x+10|=4
|6x|= -6
|-1|
x=1