Write the equation of the line that passes through the points (1,2) and (9,-4)

You are trying to write this in y=mx+b form. m is the slope, found by taking rise over run. rise is -4-2=-6, and run is 9-1=8. so -6/8=-3/4. now plug that into the equation. y=-3/4x+b. to find b, plug in one of the points. I chose (1,2). 2=-3/4(1)+b. now solve.
2=-3/4+b
8/4+3/4=11/4
b=11/4
so, y=-3/4x+11/4

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.

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.