Answer: y=6x+15
Explanation:
Formula for point-slope (you were given a point and the slope)

where m is your slope
is your point
y-3=6(x-(-2)) plug in and simplify the negative in the parentheses
y-3=6(x+2) distribute
y-3=6x+12 add 3 to both sides
y=6x+15 this is your answer in slope-intercept form