Final answer:
To plot the solution of the equation on the number line, isolate the variable x by subtracting 12 from both sides and then multiply by 7 to eliminate the fraction. The solution is -21.
Step-by-step explanation:
The equation given is 9 = 12 + (x/7).
To plot the solution of the equation on the number line, we need to isolate the variable x. Subtract 12 from both sides of the equation to get -3 = (x/7).
Multiply both sides of the equation by 7 to eliminate the fraction. The resulting equation is -21 = x.
Plotting -21 on the number line will give us the solution to the equation.