Question

What is the function that describes this sequence?

x y
1 3
2 6
3 9
4 12


a)y = 3/n




b)y = 3n




c)y = n/3




d)y = n + 3

Answer 1

Its b. Because everything has a common multiple of 3.

Answer 2

\(\begin{array}{llll}
x&y
\\\hline\\
1&3&3\cdot x\to 3\cdot 1\\
2&6&3\cdot x\to 3\cdot 2\\
3&9&3\cdot x\to 3\cdot 3\\
4&12&3\cdot x\to 3\cdot 4
\end{array}\)