Which of these describes $f : \mathbb{R} \to \mathbb{R}$, $f(x) = 3x - 5$?

Explanation

1. 01

   $3a - 5 = 3b - 5$ gives $a = b$: one-one.

2. 02

   For any $y$, $x = \frac{y + 5}{3}$ gives $f(x) = y$: onto.