As the notice states you may request an in-person DMV hearing or you may request a hearing by affidavit.  The Notice of Registration Suspension provides instructions on how to submit an affidavit to DMV if that is what you choose to do.
why do we need the hearing?
The purpose of the hearing is to determine whether the tolling authority notified you that you failed to pay tolls, fees or other charges related to 3 or more violations of the Authority’s toll collection regulations, all such violations committed within a 5-year period, or failed to pay $200 in tolls accumulated within 5 years, if the violations occurred in a commercial vehicle. At the hearing, you may NOT dispute whether you evaded a toll and/or failed to pay tolls, fees or other charges.
so I can just do the affidavit on the hearing and I won't have to show up?