Given:
9k = 40.5
We are to find the solution of the equation:
9k = 40.5
Let's make k subject of formula by dividing both sides by 9
9k/9 = 40.5/9
the 9 cancels out on the left hand side
k = 40.5/9
k = 4.5
Therefore, the solution to the equation 9k = 40.5 is 4.5
S