Relax

Respuesta :

Answer:

Answer = 3

Step-by-step explanation:

Constant of proportionality = slope

[tex]Slope=\frac{y^{2}-y^{1} }{x^{2}-x^{1} } =\frac{12-9}{4-3}=\frac{3}{1}=3[/tex]

Answer: 3! Hope this helps!