Carlos walks 4 miles every night for exercise. Its takes him exactly 64 minutes to finish his walk.

A. Assuming he walks at a constant rate write an equation that represents how many miles y carlos can walk in x minutes

The answer would be 64x=4

Ok, so if he walks 4 miles per 64 minutes, or 4 miles/64 min which will reduce to 1 mile / 16 min, then the numbers of miles he walks in a given number of minutes would be

1/16 * number of minutes

The question states we represent miles with y and number of minutes with x, so ...

y = 1/16x

So let's check it ...

How many miles (y) in 64 minutes (x)

y = 1/16x

y = 1/16 * 64

y = 64/16 = 4 miles

Yep! It checks!