Hello there! :)
If 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:
y-y1=m(x-x1)
y-0=3(x-2)
y-0=3x-6
y=3x-6
Therefore, that's the equation. The right option is Option C.
I hope this helps you.
Please let me know if you have any doubts.
Good luck on your assignment.
~GracefulGirlie :-)