It's impossible to identify the relationship between 'x' and 'y' from only this much information.
Some possibilities are:
y = x + 6
y = 1.75x
y = 2x - 2
y = 0.5x + 10
y = 0.25x + 12
y = x2 - 6x - 2
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What is y? Fx varies with x, but y could be anything.
6
14
17 plus 14 plus 8 equals.... 39 !
If: x -6 = 8 Then: x = 14