Why did farmers want the two houses to check each other?

The framers want to prevent any house from becoming too powerful. and to create a check and balance.

Explanation:

In 1787 Framers have created two branches in legislative assembly. U. S. House of representative established as lower house and U. S. senate as higher house. When any new law is proposed both houses need to arrive at a consensus as they did not want any part of government to be more powerful. As there are two houses they keep check and balance on each other.