Answer: D. subtracted 60 from both sides
Explanation:
How does someone get from 315 = 15p + 60 to 255 = 15p? To solve 315 = 15p + 60, we would need to isolate the variable p.
To isolate the variable p, the first step in solving the equation would be to subtract 60 from both sides; it would look like this:
> Step 2: 315 - 60 = 15p + 60 - 60
If you solve this out, you get:
> Step 3: 255 = 15p
Step two subtracts 60 from both sides of step one to achieve step 3.