someone explain how I know which is x1,y1,etc
>>8608477
basically it's just getting y/x wich means " by how much y vary for a given change in x
Mef should be yf-ye/xe-xf
>>8608505
yf-ye/xf-xe
>>8608477
It doesn't matter which is which, so long as you pick one set of co-ordinates and stick with them
>>8608477
The one with the lower x coordinate is x1/y1.