Understand the Function Concept Practice Test

A student records the relationship between the number of laps they run ($x$) and the minutes it takes ($y$) as the set of ordered pairs:

${(1,6),(2,12),(3,18),(4,24)}$

Is this relation a function?

A relation is graphed as the set of points $(0,2)$, $(0,-2)$, $(1,1)$, and $(-1,1)$.

Is this relation a function (use the vertical line test)?