1003124004

Find the value of a parameter $a\in \mathbb{R}$ so that the point $B=[1;4;5]$ lies on the straight line $p$ defined by the parametric equations $$\begin{array}{rl}p:x& =-1+m,\\ y& =2+am,\\ z& =3+m;m\in \mathbb{R}.\end{array}$$