Drag each tile to the correct location. Each tile can be used more than once, but not all tiles will be used. Elani signed up for an installment plan with 0% interest to purchase a new couch that costs $770. She creates an equation to model the situation, where x represents the number of months and y represents the balance of the installment account:

y = 770 − 55x.

Determine the missing steps and justifications in the solution.​