Question 730492
x1	y1	x2	y2									
-18      	-9    	-19    	-13    									
												
The general equation of the line when co-ordinates of two points are given is												
												
{{{(y-	y1)/(	y1-y2) = (x-x1)/(x1-x2)}}}										
												
{{{(y-	-9    	)/(	-9    	-	-13    	)=(x-	-18      	)/(	-18    	-	-19    	)}}}
												
												
{{{(y-	9      	)/(	4      	)=(x+	18      	) /(	1      	)}}}				
												
{{{ 	1     	(y-	9      	) =	4      	(x-	-18      	)}}}				
												
      	y-	9      	=	4      	x  	-72      						
												
1      	y=	4      	x	-63      								
/	1      											
      	y=	4      	x-63