Final answer:
Without specific equations that relate the variables x and y for the side lengths given, it's not possible to determine the exact numerical values for these variables. Normally, for a given linear equation, one could plug in values for one variable to find values for the other and represent this relationship graphically.
Step-by-step explanation:
To find the values of the variables and then the lengths of the sides given in the expressions (y - 1), (2x - 7), (2y-5), and (3y - 9), we must first have an equation or set of equations that these variables satisfy. However, the question does not provide specific equations relating x and y that can be used to solve for these variables. In general, when you have a system of linear equations, such as y = 9 + 3x, you can plug in different values for x to find corresponding values for y, which can then be represented in a graph or table. This process helps visualize the relationship between x and y. But in the absence of explicit equations that relate x and y for the side lengths provided, we cannot determine the exact numerical values for these variables.