The line L has equation 3x + 4y -12 =0

The gradient of line L is: ?

The line crosses the y axis at the point P with coordinates: ?

The line crosses the x axis at the point Q with coordinates: ?

The triangle formed by the line and the x and y axes has area =
square units

For non-integer solutions, express the answer as a proper or an improper fraction using the notation a/b