Consider what must be done, if anything, in order to finish the reconciliation process.

Reconciliation is a process that is specifically important in accounting in which one must see to it that two accounts which are being balance are in agreement or at most coinciding. The last step to ensure that there is indeed balance is to get the difference between the sum of the entries in the column and see to it that the difference will be zero.

Y=-2x-6 is the answer

It says in the questions that it is 6.5?