Final answer:
The equation y = 9 + 3x represents a linear equation with a y-intercept of 9 and a slope of 3. By substituting different x-values into the equation, you can find the corresponding y-values. Table A1 and Figure A1 show the values of x and y for this equation and provide a visual representation of the line graph.
Step-by-step explanation:
The equation y = 9 + 3x represents a linear equation in standard form. The number 9 is the y-intercept and the number 3 is the slope. To find the value of y for a given x, you can substitute the x-value into the equation and evaluate it.
For example, when x = -1, y = 9 + 3(-1) = 9 - 3 = 6. Similarly, when x = 3, y = 9 + 3(3) = 9 + 9 = 18.
Table A1 and Figure A1 show the values of x and y for the given equation in a tabular and graphical format. By plugging different values of x into the equation, you can calculate the corresponding values of y and plot them on a graph to visualize the line represented by the equation.