Let,
"p" represent the total cost to board the pet (food fee + charge per day included)
"d" represent the total number of days to board the pet
Now,
\($The equation to find how much Day and Night Kennel chargers :\)
\($ p\ =\ 20d+15\)
\($The equation to find how much Home Away From Home Kennel :\)
\($ p\ =\ 30d+5\)