Hi there!
We are given the slope of the line and a point that the line passes through.
We can write its equation in point-slope form first:
y-y1=m(x-x1)
y-3=3(x-3)
y-3=3x-9
y=3x-9+3
y=3x-6
Therefore, that's the answer. Hope it helps.
Let me know if you have any questions.
~GracefulGirlie
Good luck on your assignment.