We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive pseudonymised information about your use of our website. cookie policy and privacy policy.
 
+0  
 
0
107
2
avatar

I need help with this, how do you find equations of lines in graphs

 Jan 13, 2019
 #1
avatar+5172 
+2

Usually you'll try to pick two points off of the graph of the line that are clearly defined.

 

Having done that it's simple to compute the slope and then use point slope form to find the equation of the line.

 Jan 13, 2019
 #2
avatar+101431 
+1

Let's suppose that a line goes through the points  (2, 3)  and (4 , 6)

 

We can find the slope of the line as   [ 6 - 3 ] / [ 4 - 2]  = 3 / 2

 

Using this  and the either of the points....we have

 

y = (slope) ( x - x coordinate of point) + y coordinate of point

 

y = (3/2) ( x - 2) + 3            distribute the 3/2 over the terms in parentheses

 

y = (3/2)x - 3  + 3

 

y = (3/2)x 

 

And that's the equation of the line

 

 

cool cool cool

 Jan 13, 2019

8 Online Users