SOLUTION: Any help would be appreciated.... At 10:00am a plane was 1600 ft above ground, at 10:40 it was 1200 ft above ground. Write an equation. Thanks

Question 259032: Any help would be appreciated....
At 10:00am a plane was 1600 ft above ground, at 10:40 it was 1200 ft above ground. Write an equation.
Thanks
Answer by drk(1908) (Show Source): You can put this solution on YOUR website!
We really have 2 coordinates in disguise here:
(0,1600) and (40,1200)
step 1 - we can find the slope as

putting in our x,y information, we get

which means

--
step 2 - find the value of b using
y=mx+ b.
picking a point and using our slope, we get

--
step 3 - write the answer as

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