Question

Let vector r1(t) = <-1, 13, 0> + t <0, 3, 1> and vector r2(s) = <-4, 7, -5> + s <-1, 0, -1>. Find the point of intersection, P, of the two lines vector r1 and vector r2.
a) P = <-3, 20, -5>
b) P = <-2, 20, -4>
c) P = <-4, 20, -6>
d) P = <-3, 21, -5>