One-to-One Functions and Implied Domains (VCE SSCE Mathematical Methods): Quizzes

Different $x$-values give different $y$-values

No, both $x=1$ and $x=3$ map to $y=4$

Yes, each $x$ maps to a unique $y$

If a function is one-to-one

No, a horizontal line crosses it twice

Yes, horizontal lines cross it once only

$[\frac{5}{2}, \infty)$

$\mathbb{R} \setminus \{\frac{5}{2}\}$

Expression under root must be $\geq 0$

Denominator cannot equal zero