(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A line from point m(4,8,-2) is due south and has a grade of -50% to pt. n. complete the location of n(?,2,?) and give the true length of the line.

2. Relevant equations

Grade: \frac{rise}{run} x 100%

The plane H, F and S - if someone knows about this other than me

The bearing can only be determined in the horizontal plane (north south ETC.)

3. The attempt at a solution

This is a graphing subject... and im using an orthographic paper...

Lemme explain....

the point is m(4, 8, -2)... so the line downward is due south in the horizontal plane since the bearing can only be determined in the horizontal plane... but my *problem* is where is the line??

The grade here is 50% so

-50 / 100 = - 1 / 2

so 1 to the rise and 2 to the run from n thus it is going down one unit and going to the left 2 units since it is negative... but i dont know where n lies... so this is my *problem*

and im suspecting that n lies at the y coordinate... but cant still get the point n

I dont know if i posted this on the right thread but forgive me

please help and give some hints if theres any engineer/architect having knowledge of this...

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Descriptive geometry

**Physics Forums | Science Articles, Homework Help, Discussion**