Question

Which set of ordered pairs is a function A (-1,3),(1,4),(-1,5). B (5,3),(-6,3),(-2,4) C (0.5,1.6),(1,1.75),(1.5,2.3)(0.5,3.6) or D (1,2),(-5,4),(3,6),(-5,2)

Answer 1

the one that does NOT have an X-REPEAT

Answer 2

It is B

Answer 3

let us check the first one, say A \(\large \begin{array}{llll}
A (&{\color{brown}{ -1}},3),(1,4),(&{\color{brown}{ -1}},5). B (5,3),(-6,3),(-2,4)\\
&\uparrow &\uparrow \\
&{\color{brown}{ repeat}}&{\color{brown}{ repeat}}
\end{array}\)

so A has an X-REPEAT, thus is not a function

so.. check the others