find a vector equation of the line, which passes through the point (1,3,11) and is perpendicular to the yz-plane

Answer 1

if it's perpendicular to the y-z plane, then it has only an x component. So, it would be

r = (1+t)i + 3i + 11i

where t can be any real number.

Answer 2

make that

r = (1+t)i + 3j + 11k