Tables with lines of text in a fixed width in Beamer

Question

So I'm making some slides that have a table-like structure to them. On the left will be an example, and on the right will be the definition. I also want it to use the pause feature since I'll be going through them one at a time and so I'm using tabular rather than table (since I've haven't found a way to make table and pause work in Beamer). Ideally, I'd just have the widths be half way down the slide.

So far I've figured out how to resize the box but it makes text really small. I'd want a way to keep the text the same size as regular, but have the table automatically begin the next line once the table cell's width is used up.

For example

\begin{frame}

\resizebox{\textwidth}{!}{%
\begin{tabular} {l l}
     2x+3y=4 & \textbf{linear equation} (in the variables $x_{1}, \dots ,x_{n}$): An equation that can be written in the form $a_{1}x_{1}+a_{2}x_{2}+ \cdots +a_{n}x_{n}=b$, where $b$ and the \textbf{coefficients} $a_{1}, \dots, a_{n}$ are real or complex numbers, and $n$ may be any positive integer. \\
\pause
     Example & Definition \\
\end{tabular}
} % end of scope of "\resizebox"  directive

\end{frame}{}

Answer 1

A small variation of the @leandriis answer (+1):

\documentclass{beamer}
\usepackage{tabularx}
\usepackage{amsmath}

\begin{document}
\begin{frame}%[t]
\begin{tabularx}{\linewidth}{@{} lX @{}}
\only<1->{
$2x+3y=4$   &  \textbf{linear equation} (in the variables $x_{1}, \dotsc ,x_{n}$): 

                An equation that can be written in the form 
                    \begin{gather*}
                a_{1}x_{1}+a_{2}x_{2}+ \dotsm +a_{n}x_{n}=b,
                    \end{gather*}
                where $b$ and the \textbf{coefficients} $a_{1}, \dotsc, a_{n}$ are real or complex numbers, and $n$ may be any positive integer $(n \in \mathbb{Z})$. \\
        }
\only<2->{
     Example & Definition \\
        }
\end{tabularx}
\end{frame}
\end{document}

Answer 2

With the help of tabularx and its variable with X type column you can ensure that a table is as wide as a given width:

\documentclass{beamer}
\usepackage{tabularx}

\begin{document}

\begin{frame}
\begin{tabularx}{\textwidth}{lX}
     2x+3y=4 & \textbf{linear equation} (in the variables $x_{1}, \dots ,x_{n}$): An equation that can be written in the form $a_{1}x_{1}+a_{2}x_{2}+ \cdots +a_{n}x_{n}=b$, where $b$ and the \textbf{coefficients} $a_{1}, \dots, a_{n}$ are real or complex numbers, and $n$ may be any positive integer. \\
\pause
     Example & Definition \\
\end{tabularx}
\end{frame}

\end{document}