The image shows a partial calculation where $x=1$ is substituted into an expression related to the equation $x - 2y = 2$. Step 1: Identify the equation and substitution. The expression shown is $x - 2y - 2$. If this expression is set to zero, it represents the equation $x - 2y = 2$. The student has substituted $x = 1$ into this expression, resulting in $1 - 2y - 2$. Step 2: Solve for $y$. We set the expression equal to zero to find the corresponding $y$ value for the line $x - 2y = 2$: $$1 - 2y - 2 = 0$$ Combine the constant terms: $$-1 - 2y = 0$$ Add 1 to both sides: $$-2y = 1$$ Divide by $-2$: $$y = \frac{1}{-2}$$ $$y = -0.5$$ The value $y = 0.5$ shown at the top of the image is incorrect for this calculation. The correct value is $y = -0.5$. The final answer is $\boxed{-0.5}$.