Hi I have problems in some questions.

A) My answers to these questions do not match the book answers:-

1) The three vertices of a paralleologram are and . Find the fourth vertex.[Book Answer: ](Solved)

2) The area of a triangle is . Two of its vertices are and . The third vertex lies on . Find the third vertex.[Book Answer: and . How am I supposed to get the second answer](Solved)

3) The point divides the join of and in the ratio . Find the values of for which the area of triangle ABC where is and is equal to 2 units.[Book Answer: or ]

B) Can't even guess what to do:-

1) Find the locus of the mid-point of the portion of the line which is intercepted between the axes.[Book Answer: ]

2) Find the equation of the bisector of angle of the triangle whose vertices are and .[Book Answer: ](Solved)

3) Find the distance of the point from the line measured parallel to a line having slope .[Book Answer:5^(1/2)](Solved)

4) Find the distance of the point from the line measured parallel to a line having slope .[Book Answer: ](Solved)

That's all. Thanks