A farmer is planting corn and soybeans. Each acre of corn requires 4 hours of labor to plant, and each acre of soybeans requires 3 hours of labor. The equation represents the total labor hours required to plant acres of corn and acres of soybeans. If the farmer plans to plant 12 acres of corn, how many acres of soybeans can the farmer plant using the total available labor hours?
6
8
9
10
