Respuesta :

apologiabiology
so
ollie=x

x-8=y
y=3x-16

subsitute y=3x-16 for y in the first equation so

x-8=3x-16
subtract x from both sides
-8=2x-16
add 16 to both sides
8=2x
divide both sides by 2
4=x
ollie is 4