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# Math Homework Help Part 2! :)?

West of a city, a certain eastbound route is straight and makes a steep descent toward the city. The highway has a 9% grade, which means that its slope is -9/100

Driving on this road, you notice from elevation signs that you have descended a distance of 1000 ft. What is the change in your horizontal distance in miles? (Round your answer to two decimal places.)

Update:

I tried this method that you gave (dx = -1000/(-9/100) = 11111.11 ft) and it said it was incorrect why is that?

### 1 Answer

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- jacob sLv 71 month ago
dy/dx = -9/100

descended a distance of 1000 ft. = dy = -1000 ft.

dx = -1000/(-9/100) = 11111.11 ft

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