Find the Slope of the Line Containing the Given Points $P _ { 1 } ( 2,8 ) , \quad P _ { 2 } ( 3,11 )$

Find the slope of the line containing the given points. $P _ { 1 } ( 2,8 ) , \quad P _ { 2 } ( 3,11 )$

A) -3
B) 3
C) $- \frac { 1 } { 3 }$
D) $\frac { 3 } { 5 }$
E) Undefined