Answer:
D
Step-by-step explanation:
A first order equation has the following format:
[tex]y = ax + b[/tex]
In function notation, we use y = f(x), so:
[tex]f(x) = ax + b[/tex]
In this problem:
x - 2y = 8
(-2y = 8 - x)*(-1)
2y = x - 8
y = (1/2)x - 4
f(x) = (1/2)x - 4
So the correct answer is
D