Final answer:
To solve for r in the equation K = 8r - s, add s to both sides of the equation and divide both sides by 8, resulting in r = (K + s)/8.
Step-by-step explanation:
To solve for r in the equation K = 8r - s, we need to isolate r.
We can start by adding s to both sides of the equation to get K + s = 8r.
Then, we divide both sides by 8 to solve for r.
The final equation is r = (K + s)/8.