Answer:
All you have to do is replace p with 5, and see if it works. In this case it doesn't because 5+13 does not equal 21.
Answer:
Not a solution
Step-by-step explanation:
You would plug 5 into the equation where it says p. If 5+13=21, then it is a solution. If it equals to something different, then it is not a solution. In this case, it adds up to 18, making it not a solution.