Final answer:
The value of j when m = 7j is found to be -3/2 by substituting m with 7j in the given function j = m + 9 and rearranging the resulting equation.
Step-by-step explanation:
To find the value of j when m = 7j, we can use the given function j = m + 9. If we substitute m = 7j into the function, we get j = 7j + 9. To solve for j, we then rearrange the equation to 0 = 7j - j + 9, which simplifies to 0 = 6j + 9. Solving for j gives us j = -9/6 or j = -3/2. Therefore, the value of j, when m = 7j, is -3/2.