Use the Limit Process to Find the Slope of the Graph

Multiple Choice

Use the limit process to find the slope of the graph of $\sqrt { x + 7 }$ at $( 2,3 )$ .

A) $\frac { 1 } { 3 }$
B) $3$
C) $\infty$
D) $\frac { 1 } { 6 }$
E) the slope is undefined at this point