Question

How do I model with equation?
"a varies directly with b and inversely with c"

Answer 1

This comes from the definition, you should have it

a varies directly with b and inversely with c
\[\large a = k\frac{ b }{ c}\]
k is a constant

directly means the number is on top of the fraction

inversely means it's on the bottom of the fraction

Answer 2

Thanks!