Final answer:
The question seems to be asking to find the value of x in relation to parallel lines m and n, but the provided data is about plotting a straight line using the equation y = 9 + 3x. Without further information regarding the lines m and n, we cannot determine the value of x.
Step-by-step explanation:
If line m is parallel to line n and we are tasked with finding the value of x, we must have additional information about the lines or the angles they form with other lines. However, based on the information given, it appears that we do not have a figure or other critical information necessary to solve for x. The data provided relates to the equation of a straight line, y = 9 + 3x, where the y-intercept b is set to 9, and the slope m is set to 3. To construct a table of values or to plot this line on a graph, we would substitute various values for x into the equation and solve for y. This process allows us to draw the line based on the calculated points.
Without additional information specific to the lines m and n mentioned in the question, it is not possible to determine the value of x. It is important to have either information about the slopes of the lines, the angles they create with other lines, or coordinates of points through which these lines pass to solve the question accurately.