Mei and Lea each improved their yards by planting grass sod and ivy. They bought their supplies from the same store. Mei spent $51 on 9 ft2 of grass sod and 3 pots of ivy. Lea spent $71 on 13 ft2 of grass sod and 3 pots of ivy. Find the cost of one ft2 of grass sod and the cost of one pot of ivy.
