Type the correct answer in each box. Use numerals instead of words.
The sum of two numbers is 84. The square of the first number is 6 more than the second number. Write a system of equations to find the value of [tex]\( x \)[/tex], the first number, and [tex]\( y \)[/tex], the second number.
[tex]\[
\begin{array}{l}
y = -x + \square \\
y = x^2 + \square
\end{array}
\][/tex]