The equation is in Slope intercept form.
y=mx+b
Where b is the y-intercept, or 3.
And to find the x-intercept, we have to set y=0. We know the slope and the y-intercept, so this should be fairly easy.
0= -13x+3
Subtract 3 on both sides.
-3= -13x
Divide -13 into both sides.
-3/-13=x
3/13= x (two positives equal a negative)
The x-intercept is 3/13, and the y-intercept is 3.
I hope this helps!
~cupcake
