Thursday, December 6, 2007

Intersection of two straight lines

Can a graph consist of more than one straight lines?

If yes, why would someone put more than one straight line graphs on the same graph?

In the event that the straight lines intersect, what does this signify?

How can one calculate that point to verify that the graph is accurate?

33 comments:

Anonymous said...

Yes a graph can have more than one straight lines . These lines can even create shapes both 2-d and 3-d
In the case of a rectangle, two lines meet at a 90 degrees and the product of their gradients = -1. When two lines intersect it means that both of them have a common point on the graph. Another method of finding the point of intersection is the use of both equations of the lines simultaneously, substiting for one and finding its value. This value is then substituted into one of the equations and the other value is found.

marz said...

Yoshi
I agree with u saying that yes a graph can have more than one straight line. but how about it can have to staight lines that parallel to each other.
IT dont always have to with a 90 degrees right

CP3 said...

yes a line could consist of more than one straight lines.

a line only needs 2 points to be created

yes these lines could intercept this is the case of "+" and "-" gradients meeting each other at a point on the graph

SLY said...

yoshi you expained how a 2d shape may be obtained both what about a 3d shape,can you give an example so we can have a greater understanding of what you are saying.marz, the topic is about intersection of two straight lines,not parallel,which means the lines need to intersect so they cannot parallel unless maybe in a triangle.cp3 the lines do not have to have a "+" and" -" to gradient, in order for them to intersect the intersection can be also be according to cordinates of the two lines cause them to cross each others path at a point.

mathworm said...

i agree with some of the things you guys are saying. a graph can consist of more dan 1 straight line. u can put more than one line on the same graph to compare 2 or more things. For Example if a salesperson is sellin 2 products.. 1 wit a certain quantity n another wit another quantity n u get a profit. d other line wud b d seller wit different quantities n a different profit...d intersection wud b d sellin price of both products. the point of intersection will be the relationship between the two products. to verify that it is accurate u can solve it simultaneously by deriving with two equations in the for y=mx+c

Anonymous said...

i think that when two straight intersect, they do so because either of the two values or the point at which they intersect are the same.
sly
can u explain to me what u meant by parallel lines in a triangle.to my understanding parallel lines never meet.
i agree with Yoshi, in that their can have more than one straight line in a graph. what would u say about a graph made by recording time and temp when heatin a block of ice to water vapor.

Notice said...

a graph can consist of more than one straight line. a person would put more than one straight line on a graph to: (1) determine the common points of the graph i.e where the points or values are the same (2) to show if there is any relationship between them and i.e if it's parallel, perpendicular, etc (3) to show there different position on the graph paper i.e if it lies on the negative or positive or is a product of the both.

Anonymous said...

yoshi i agree with your first comment but i didn't know u can have a 3-d shape on a graph.

pussinboots said...

yoshi i fully agree with pour first state ment that lines can create 2d an 3d shapes but it will be difficult to represent a 3d figure on graph page if u know what i mean. i also agree that the pont where the 2 lines meet they have a commn point, this point where they meet can also be the mid point or middle of the line it is cutting

Anonymous said...

Yeh i 2nd that spartan i would like to know what sly means when he says "parallel lines in a triangle"?????

Anonymous said...

Yes a graph can consist of more than two straight lines

pussinboots said...

sly there are no such thig as parallel lines in a triangle. u can say 2 lines are equal in length an a triangle and so forth but a triangle cant have 2 parallel sides sly

Anonymous said...

They must put more than 1 line to show a comparsion between two things

Anonymous said...

If they intercet it shows that the both things has a common point

Anonymous said...

To check how accurate it is we use the point of intercetion an the formula y=mx+c

Anonymous said...

to sly:
ho did you get parallel lines in a three sided shape?

marz said...

Pussin boots can u explain to me what u mean by where the two lines meet it is the mid point.

I dont really agree with that
because anywhere two lines dont give a mid point

Anonymous said...

to spartan

...parallel lines do not meet...hence they have the same gradient...meaning they slope in the same direction at the same angle...they can go on and on and never mean or intersect eachother

Anonymous said...

therefore you cannot have parallel lines in a triangle because all the lines in a triangle meet...

TOP SHOTTAR said...

Yes I think that a graph can consist of more than two straight lines.

Someone or in fact I would put more than two straight lines on the same graph to compare the relationships i.e the similarities and differences of both.

TOP SHOTTAR said...

marz

can you tell me why would u put two lines on the same graph. U agreed to the question but u did not mention why.

SLY said...

To everyonethere are no parallel lines in a triangle excuse my example

Anonymous said...

top shotter

i was now thinking about that... i was thinking about a line graph....for example...the different points the lines can be compared...in terms of their different gradients. Its not to say if they are parallel etc. or not but just to compare like stocks sale in a store for example.

Anonymous said...

Yes a graph can consist of more than one straight lines.

The reason someone might want to put two straight lines in a single graph is to compare two different things.

For example the different velocities of two different vehicles. only if the two straigt lines are on the same graph could you compare or notise differences. in the two things being compared.

CP3 said...

Sly......... do u agree it could have positive and negative gradients thats just an example how lines can intersect ok

lines could intersect when one line has a steeper slope than the other so they meet at a point

Space Boy said...

yea a graph can have more than 2 straight lines and parallel lines.
A graph shows a pictorial view of information or data. For example when we did the stats project we used different types of graphs to display our data.

cokebaby said...

im confused. i think a graph can have more than one straight line. it can be of the same gradiant or different gradiants. a line can be perpendicular to the other where the product of the gradiants is -1

lilo said...

Yes i think a gragh could have two or even more straight lines. These lines could be parallel, at an angle, or perpendicular to one another depending on whether they have the same general equations , the same gradient or different have equations respectfully.

cokebaby said...

when straight lines intersect.. this signifies that they have different gradiants..

cokebaby said...

the point at which two graps intersect can be found graphically or can be solved simultaneously..correct me if im wrong

kelz said...

yes i think a graph can consist of more than one straight line. it can be used to show the relationship between two quantities or things and it can compare them aswell. i think when straight lines intersect this means that at that specific point the coordinates are the same for both lines.

kelz said...

yes i think cokebaby is correct, the point at which the lines intersect can be found and proven accurate by solving the equations of the lines simultaneously.

say wa said...

yes a graph can have more than one straight line.
when two straight intersect, the point at which they intersect are the same.