# Descriptive geometry

#### Equilibrium

1. Homework Statement
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. Homework Equations
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

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Are you using the Monge projection?

#### Equilibrium

No im using the orthograpic projection w/c consists of three planes:
in the Horizontal plane or H - lies x, and y axes
Frontal plane or F - x, z
Side plane or S - y , z

See what i tried...
im using autocad w/c is similar... but for real im really using the orthographic sheet... because this is a drafting subject see what I plotted
...
so the lines from the H plane which i drew a line is due south in which i cant determine the line from south... and the other line is the line i marked which is 2 = y... in which it has the n coordinate i did this to make it easier but i cant still get it....
plus the yellow point is the point m(4, 8 ,-2)

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