Answer:
m/n =4 is a direct variation
Explanation:
m/n =4 identify the variation as direct, inverse, joint or combined
Direct variation is y=kx
Indirect variation is y=k/x
Joint variation is the combination of both direct and indirect

Multiply by 'n' on both sides
m = 4n
'm' varies directly with 'n'
So m/n =4 is a direct variation