Respuesta :


[tex]k = \frac{y2 - y1}{x2 - x1} [/tex]
[tex]k = \frac{ - 4 - ( - 3)}{ - 12 - ( - 9)} [/tex]
[tex]k = - \frac{1}{21} [/tex]
[tex]direct \: variation \: equation \: is [/tex]

[tex]y \: or \: k = - \frac{1}{21} x[/tex]