Question

Consider the two lines l1:x=−2t,y=1+2t,z=3tl1:x=−2t,y=1+2t,z=3t and l2:x=−6+2s,y=3+2s,z=5+1sl2:x=−6+2s,y=3+2s,z=5+1s find the point of intersection of the two lines

Answer 1

Over which interval(s) is the function decreasing?