From the first relation, . Putting this value of in second relation

or

Note that it, being quadratic in , gives two sets of values of , and hence gives the d.r.s. of two lines.

Now, factorising it, we get

or

either or

Taking we get .

Also putting in , we get

Thus, we get, or

d.r.'s of one line are .

Hence, the dc's. of one line are

or

Taking , we get

or .

Putting this value in , we obtain

or

Thus

the d.r's of the second line are 1,2,3; and hence d.c.s. of sccond line are

or