The straight lines and have vector equationsr= (i+ 4j+ 2k) + t(8i+ 5j+k) andr= (i+ 4j+ 2k) + s(3i+j) respectively.Pis the point with coordinate (1, 4, 2) &Qis the point with coordinate (9, 9, 3).

Find the possible coordinates of the pointR, such thatRlies on and PQ = PR.

How could I do this?