For this question, we need to subtract 'x' from both sides of the equation to get:
-2y = -8 - x
Next, divide both sides by -2 to get 'y' alone and get:
y = 4 + 0.5x
Here, we notice that this equation is in the form of y = mx + b where the following is true:
m = slope of line
b = y-intercept of line
(x,y) = any point on the line
Therefore, in the equation obtained, we find that the slope is 0.5.