g$.$ Using the equation of the best$-$fit line, calculate the vapor pressure of water at $50C($convert the temp to Kelvin, invert it$,$ and plug the value in as $"x."$ Then solve for $"y."Y$ will be the $ln(P),$ so you should use the $e^{{?}^{{?}^{?}}}$ button on your calculator to get the vapor pressure$).$