Final answer:
To find x+y, we would substitute a value for x in the equation y=9+3x, solve for y, and then sum the values of x and y. Since no specific value for x is given, we cannot provide a definitive answer for x+y.
Step-by-step explanation:
To find the value of x+y, we first need to understand the equation provided: y = 9 + 3x. This equation indicates a linear relationship between x and y, where 9 is the y-intercept (b term), and 3 is the slope (m term) of the line. To determine specific values of x and y, we would substitute different values of x into the equation and solve for y, and then add those values to obtain x+y. However, the question does not provide a specific value for x, so a general solution is not possible without additional information.
To construct a table of values (Table A1), we select various values for x, calculate the corresponding y values, and then plot these points (x, y) on a graph (Figure A1). The line that passes through these points represents the equation y = 9 + 3x. If we have a specific value for x, we can recalculate y using the provided equation and then find x+y as required.
For example, if x=1, then y = 9 + 3(1) = 12. Thus, x+y would be 1 + 12 = 13. However, without a given value for x in the question, we cannot provide a definitive answer for x+y.