hello sandeep,

the question you have given seems to have some error or some part of the question seems missing. it would be better if you check the question one more time and text it. from the question the first equation is of a line and the second equation is of the plane in which the k is to be found but the third equation and the relation amond these equations are not mentioned which creates the doubt and confusion. kindly correct the question in a clarified way so that one can easily answer you.

all the best