This question does not completely make sense as (-1,-1) is not a point on the line. We c an show this because if x=-1 we have y=3*-1+3=-3+3=0.So when x=-1 y=0. Therefore the x intercept is -1.
The y intercept is always easy to find becuase it is the number on its own in the equation +3
so the x intercept is (-1,0) The y intercept is (0,3)