Must m, in the equatiin y = mx + b, always be a positive number

M in y=mx+b is the slope it can either be positive or negative. It does not matter, therefore the slope can be POSITIVE or NEGATIVE.

11/2.2 = 5 inches for the length 8.5/2.2= 3.86 inches for the width

At a constant it will take one hour to travel 32 mi.at that speed it will take 1/2 hr to travel the remaining 16 mi.it will take 1+1/2 hr to travel the 48mi @ 32mph.so 1 hr = 60 min& 1/2 hr = 30 min1+1/2 hr = 90 min.there are 60s in each 90 × 60 = 3600 seconds.the real question seriously is he why are they driving so slow? ! lol.