Bella is a salesperson who sells computers at an electronics store. She makes a base pay of $60 each day and is also paid a commission for each sale she makes. One day, Bella sold $1000 worth of computers and was paid a total of $70 that day. Write an equation for
P
,
P, in terms of
x
,
x, representing Bella's total pay on a day on which she sells
x
x dollars worth of computers