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# C4 Maths problem watch

1. Two straight lines l1 and l2 have equations as follows:

l1: r = 2i-j+3k+s(j-k)
l2: r = -2i+7j+3k+t(2i-3j-k)

Position vector of their point of intersection: 2i+j+k
The angle between l1 and l2 is 68 degrees

(iii) The foot of the perpendicular fro the point with position vector -2i+7j+3k to the line l1 is P. Find the position vector of P.

Help please!
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