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Read the following description of a data set. Walter thinks that text messaging is causing him to talk less on the phone. For one month, he examined his text message and call logs with his closest friends.For each friend, Walter checked the number of text messages he sent to that friend, $x$, and the number of minutes they spoke on the phone, $y$.The least squares regression line of this data set is: $y = -2.336x + 856.039$ $\newline$Complete the following sentence:$\newline$ If Walter sent one more text message to a friend, the least squares regression line predicts he would have spent $\_\_$ fewer minutes on the phone with them.