Final answer:
To determine the equation representing the graph of f(x), you need to compare the slope and y-intercept of the graph with those in the given equations. Without a description or image of the graph, we cannot give a definitive answer.
Step-by-step explanation:
The equation that represents the graph of f(x) can be determined by understanding the characteristics of the graph in terms of slope and y-intercept based on the equation form y = a + bx. 
Let's analyze the information provided: 
- If b > 0, the line slopes upward to the right, indicating a positive slope. 
 - If b = 0, the line is horizontal, which suggests that the slope is zero, and the y-value is constant. 
 - If b < 0, the line slopes downward to the right, indicating a negative slope. 
 
From the options provided: 
- y = x - 2 suggests that the slope is 1 (since it's just x without a coefficient) and the y-intercept is -2. 
 - y = x + 2 has a slope of 1 and a y-intercept of +2. 
 - y = -2 represents a horizontal line through y = -2, hence the slope is 0. 
 - y = x + 2 is repeated and has the same characteristics as the second option.
 
Without additional information about the specific graph you are asking about, we cannot give a definite answer. However, if you were to provide a description of the graph (like its slope and intercept), or a visual representation, we would be able to determine which equation matches the graph of f(x).