Question

How to graph ( -3, -1) and the slope is m= -1/5 please show me in details with explanation

Answer 1

m=x/y
just it !:)

Answer 2

you want the equation of the line?

Answer 3

Nope

Answer 4

so what is it? :D

Answer 5

Never mind I got it thank you

Answer 6

Nope

Answer 7

sorry I think m=x/y is discorrect!

Answer 8

say what do you want

Answer 9

I think I should graph the points then I take the slope either I go up or move right

Answer 10

Am I right?

Answer 11

yes you're right but you should use this formula:
tan(Theta) = m

Answer 12

I m sure for this :)

Answer 13

there is no problem :)

Answer 14

x/y is incorrect,(y2-y1)/(x2-x1) is correct and then you can use this:
y/x not x/y!

Answer 15

and besides that,line pasts two points not one points!

Answer 16

Why should I use tan (theta) =m

Answer 17

I take algebra 2 only

Answer 18

if you have "mesure of angle" you should use tan(theta) but if you know "2 points" you can use (y2-y1)/(x2-x1)

Answer 19

K I got u thnx!

Answer 20

You're welcome,Have a look at this too:
http://en.wikipedia.org/wiki/Slope

Answer 21

http://upload.wikimedia.org/math/9/d/9/9d9e1aa5fab25d8dd659c0fb6e83234b.png
http://upload.wikimedia.org/math/6/f/f/6ff91586a0e41749e401e86de39d5ade.png

Answer 22

got it?

Answer 23

Yup sure did :) thnx again

Answer 24

You're welcome:)

Answer 25

No need for trig in this problem.

You are on the right track with plotting the point and then using the slope to get a 2nd point, but I worry what you mean by "either I go up or move right". :)

You need to use the slope to determine the RISE and the RUN. You will EITHER move up or down the RISE, and you will EITHER move left or right the RUN.

The combination depends on the sign of the slope.

For positive slope, you want x and y to change in the same direction.... so you either go UP and RIGHT (both y and x increase) or DOWN and LEFT (both y and x decrease), in the amounts, respectively, of the rise and run. Either will work and will give you a 2nd points.

For negative slope, you want x and y to change in opposite directions.... so you either go UP and LEFT, or DOWN and RIGHT.

Once you have that 2nd point, draw the line through those 2 points.

This method will work fine, although it isn't quite as "slick" as just cooking up the equation for the line. Then you can get any 2nd point on the line from the equation (like say, the y-intercept).

Answer 26

Wow!!! Ur good thanx!!! But what if my slope is negative like -3 should I do this -3/1 then find it?

Answer 27

Yes, you can interpret that slope as:

\(\Large m=-3=-\dfrac{3}{1}=-\dfrac{rise}{run}\)

So for each change of 3 units of "rise" (in the vertical direction, or in the y-coordinate, however you find it most natural to think of it), you will change 1 unit in "run" (in the horizontal direction, or in the x-coordinate).

AND since slope is NEGATIVE, the changes must go in OPPOSITE directions.

So from wherever your starting point is, you could either go:

Up 3 and left 1 (increasing y, decreasing x)
or
Down 3 and right 1 (decreasing y, increasing x)

Either works fine, they just give you two different options for the "2nd point".

Answer 28

OMG!!!! THANK YOOOUUU!!!!! I REALLY GET IT!!!

Answer 29

Could the second point be 3, -1?

Answer 30

@DebbieG

Answer 31

Could the second point be 3, -1?