<span>C.
Each y-value has only one x-value.
y value can have many x-values</span>
Moving left subtracts from the x value the number you move.
In (2,9) the x value is the number 2
You move 1 unit to the left so subtract 1 from 2:
2-1 = 1
You will be at (1,9)
W = 17/13.
I hope this helps. I'm pretty sure I got it wrong, but just let me know.
Graph will look like this if this is one of the options
I have nothing to go off on, but an equation that would fit for (1,2) is y=2x.
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hope it helps