Suppose an estimated simple linear regression equation is given as $$E[y| \textbf{x}] = \hat{\beta}_{0}+ \hat{\beta}_{1}\textbf{x}$$
Then the interpretation of the slope is as follows: For a unit increase in $\textbf{x}$, $E[y| \textbf{x}]$ increases by $\hat{\beta}_{1}$. Can this same equation be used for predicting $y$ from some given $\textbf{x}$?