Question

if (1,2) ,(4,y ) , (x,6 ),(3,5) are the vertices of a parallelogram taken in order find x and y

Answer 1

The graph would be like this

Therefore the coordinates are
(1,2), (4, 3), (6,6), (3,5)

Here x = 6
And y =3

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Answer 2

as you know midpoints of diagonals of parrellogram are same
so use mid point formula of bot line ac and bd
then mid points of both of them are equal
so equate corresponding sides 
if you do all right then your answer must be
x=6
y=3