+0  
 
0
32
3
avatar+314 

what is graphed here 

http://prntscr.com/l28bjw

critical  Oct 4, 2018
 #1
avatar+89909 
+1

We have the points on the graph  (5,5)  and (20,10)

 

The slope between these points  is  [ 10 - 5 ] / [ 20 - 5] =   5 / 15  = 1/3

 

The equation of the line is

 

y  = (1/3) (x - 5)  + 5      multiply through by 3

 

3y = x - 5  + 15

 

3y  = x  + 10    subtract x from both sides

 

3y  - x   = 10   [first answer ] 

 

 

cool cool cool

CPhill  Oct 4, 2018
 #2
avatar+314 
+1

how did you get this portion 

http://prntscr.com/l28htj

critical  Oct 4, 2018
 #3
avatar+89909 
+1

y = (1/3) (x - 5)  + 5   multiply everything by 3

 

3y  = 3(1/3) (x - 5) + 3(5)  

 

3y  = 1 (x - 5)  + 15

 

3y  = x - 5 + 15

 

3y   =  x + 10

 

 

cool  cool cool

CPhill  Oct 4, 2018

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