Final answer:
The correct function that represents the relationship between x and y, following the form y = mx + b, is C) y = x + 4. This matches the solutions provided in the practice test materials.
Step-by-step explanation:
The student is asking about the relationship between two variables, x and y, depicted in a linear equation. This sort of equation takes the general form y = mx + b, where m represents the slope of the line and b represents the y-intercept. The question gives four options and requires identifying which one correctly describes the relationship between x and y.
To determine the correct relationship, consider the practice test solutions that indicate the form of the linear equation y = mx + b.
Matching this information to the options provided, we can rule out options A, B, and D because they are not in the form suggested by the reference information.
Hence, the correct function that represents the relationship between x and y would be C) y = x + 4.
This is supported by the practice test solutions, which indicate that when y represents the number of hours required and x represents the square footage in units of 1,000, the equation is y = x + 4. It is also formatted as a linear equation consistent with the definition used in the course.