Final answer:
The slope of a line parallel to x - y = 8 is 1.
Step-by-step explanation:
The equation given is x - y = 8. To find the slope of a line parallel to this line, we need to rearrange the equation to slope-intercept form, y = mx + c, where m is the slope.
Rearranging the equation: y = x - 8. Comparing this equation with the slope-intercept form, we can see that the slope is 1.
Therefore, the slope of a line parallel to x - y = 8 is 1.