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Elani signed up for an installment plan with [tex]$0 \%$[/tex] interest to purchase a new couch that costs [tex]$\$[/tex] 770[tex]$. She creates an equation to model the situation, where $[/tex]x[tex]$ represents the number of months and $[/tex]y[tex]$ represents the balance of the installment account:
\[ y = 770 - 55x \]
Determine the missing steps and justifications in the solution.
\[
\begin{array}{l}
\text{subtraction property of equality} \\
y - 770 = -55x \\
\frac{y - 770}{-55} = x \\
\frac{y - 770}{55} = -x \\
y - 770 = -715x \\
\text{addition property of equality} \\
\end{array}
\]
\begin{tabular}{|c|l|}
\hline
Steps & \multicolumn{1}{|c|}{Justification} \\
\hline
$[/tex]y = 770 - 55x[tex]$ & given \\
\hline
$[/tex]y - 770 = 770 - 55x - 770[tex]$ & subtraction property of equality \\
\hline
$[/tex]y - 770 = -55x[tex]$ & simplification \\
\hline
$[/tex]\frac{y - 770}{-55} = x$ & multiplication property of equality \\
\hline
\end{tabular}