Final answer:
The incomplete question involves identifying a linear equation, typically in the form of y = mx + b, where y depends on x. A specific option could not be selected without additional information.
Step-by-step explanation:
The question tests the understanding of linear equations, which are mathematical statements that describe a relationship between two variables, typically x and y, where y is the dependent variable and x is the independent variable. In a linear equation of the form y = mx + b, m represents the slope, and b represents the y-intercept. From the provided options, the correct equation to match with given variables x and y could not be determined due to the incomplete information in the question. However, option 2, which states 'y = x + 4' is a linear equation connecting y and x, can be used as an example to illustrate the concept. If a question provided a specific x and y value to match, you would select the equation that allows you to plug in x to get the corresponding y value, or vice versa.