Friction and coefficient of friction questions!

Whenever a numerical value of g is required take g=9.8 metres per second per second

1)A body of mass 2kg is held in limiting equillibrium on a rough plane inclined at 20 degrees to the horizontal by a force of Y at an angle of 45 degrees to the horizontal. The coefficient of friction between the body and the plane is 0.2. Modelling the body as a particle find Y when the body is on the point of slipping.

a) up the plane

b) down the plane

Any help would be much appreciated :)