Membership in Oakwood Country Club costs $3000 per year and entitles a member to play a round of golf for a greens fee of $18. At Pinecrest Country Club, membership costs $2500 per year and the greens fee is $20.

(a) How many rounds of golf must a golfer play in a year for the total costs at the two clubs to be the same?

(b) If Tamika planned to play 30 rounds of golf in a year, which club would be the least expensive?

Write a system of equations that can be used to solve the problem. Then solve the system and determine the answer.