Answer
$$y = mx + 6$$
Work Step by Step
$$\eqalign{
& {\text{We know the slope }}m{\text{ and the y - intercept }}\left( {0,6} \right) \cr
& {\text{The equation of the line with slope m and y - intercept}}\left( {0,b} \right){\text{ is }}y = mx + b \cr
& {\text{We know the slope }}m{\text{ and the point }}\left( {0,6} \right) \cr
& {\text{from the point }}\left( {0,6} \right){\text{ we obtain }}b = 6 \cr
& {\text{then}} \cr
& y = mx + b \cr
& y = mx + 6 \cr} $$