Answer:
[tex]k=3[/tex]
Step-by-step explanation:
1) The Proportionality Constant (k) is given by the following ratio:
[tex]k=\frac{y}{x}=\frac{3}{1}=\frac{6}{2}=\frac{9}{3}\Rightarrow k=3[/tex]
This shows that this function is a linear function (with b=0), and proportional one, that can also be written in this form:
[tex]y=kx \: \Rightarrow y=3x[/tex]
