Write an Equation of the Line Satisfying the Given Conditions $( 12,9 )$

Write an equation of the line satisfying the given conditions. Write the answer in slope-intercept form.
-The line passes through $( 12,9 )$ and $( 9,9 )$ .

A) $y = - \frac { 1 } { 6 } x + \frac { 21 } { 2 }$
B) $y = - \frac { 1 } { 6 } x - \frac { 21 } { 2 }$
C) $x = 9$
D) $y = 9$