Respuesta :

gmany

Solve for a:

[tex]5a+c=-8a\ \ \ |-c\\\\5a=-8a-c\ \ \ |+8a\\\\13a=-c\ \ \ |:13\\\\\boxed{a=-\dfrac{c}{13}}[/tex]

Solve for c:

[tex]5a+c=-8a\ \ \ \ |-5a\\\\\boxed{c=-13a}[/tex]