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The linear fit through the line is some y(x). Let's say y=x for simplicity.

So a residual is defined as the actual value minus the estimated value (using y).

My question is, let's say for one x value there are two y values.

e.g., for x=2; y=4 and y=6

If you wanted to calculate the residual at x=2, would you have two separate values or is there someway to combine it?

The estimated value would be y=2.

residuals are: 2-4 and 2-6, which is -2 and -4. So in other words do you add the two values?