Final answer:
The time to complete a painting job can be expressed as a linear equation, T = 4 + 1 · S, where T is total time in hours and S is the area size in thousands of square feet.
Step-by-step explanation:
To express the time taken to complete a painting job as a linear equation, we consider the given information that there is a four hours setup time and an additional one hour for every 1,000 square feet to be painted. Let's denote T as the total time in hours, and let S be the size of the area to be painted in thousands of square feet.
The linear equation can then be written as:
T = 4 + 1 · S
This equation indicates that for every additional 1,000 square feet of area, you will need an extra hour on top of the initial four hours of setup time.