The sentence written in the passive voice is "The main points were summarized."
To identify the sentence written in the passive voice, you need to look for a sentence where the subject is being acted upon rather than performing the action. In this case, the sentence "The main points were summarized" is written in the passive voice because "The main points" is the subject and is being acted upon by the verb "were summarized." The sentence "I summarized the main points" is written in the active voice because the subject "I" is performing the action of summarizing the main points.
