IF DF = 114, DE = 7x + 9, and EF = 9x + 9, find EF.

Answer:
EF = 63
Explanation:
DE + EF = DF
7x + 9 + 9x + 9 = 114
16x + 18 = 114
16x = 96
x = 6
EF = 9(6) + 9
EF = 54 + 9
EF = 63