Final answer:
The length of the living room wall on the blueprint is 8 units.
Step-by-step explanation:
To find the length of the living room wall on the blueprint, we need to calculate the distance between the two given points (9, -3) and (1, -3). Since the y-coordinates are the same, we only need to find the difference between the x-coordinates.
Using the distance formula, d = √((x2 - x1)^2 + (y2 - y1)^2), we have:
d = √((1 - 9)^2 + (-3 - (-3))^2)
d = √((-8)^2 + 0^2)
d = √(64 + 0)
d = √(64)
d = 8
Therefore, the length of the living room wall on the blueprint is 8 units long.