Byron jogs home from a park at an average speed of 6mi / h After half an hour he is 4 miles from home . What is an equation , in point - slope form, that represents Byron's distance from home , y, after hours?

A. y-6=-4(x-1/2)

B. y-4=-6(x-1/2)

C. y-1/2=-6(x-4)

D. y-4=6(x+1/2)