The point $(p, 4, -3)$ lies on the line $\frac{x - 1}{2} = \frac{y - 2}{1} = \frac{z + 1}{-1}$. What is $p$?

Explanation

1. 01

   From $y$: $\frac{4 - 2}{1} = 2$; $z$ agrees, $\frac{-3 + 1}{-1} = 2$.

2. 02

   $\frac{p - 1}{2} = 2$, so $p = 5$.