Pam and Rachel buy books at the bookstore where Rachel works. Each uses a coupon. As an employee Rachel pays only 75% of the advertised price after her coupon is applied. Pam bought books for $4.00 each and used a $5.00 off coupon. Rachel bought books for $8.00 each and used a $4.00 off coupon. Is it possible for Pam and Rachel to purchase x books and pay the same amount? Use the equation 4x - 5 to represent Pams purchase and 0.75(8x - 4) to represent Rachel's purchase.