Answer :

just keep going like i done in the picture replacing x and y so they add together to 6, you'll want to do negative numbers as well because the graph has a negative section
${teks-lihat-gambar} anthonysilby1
There could be a variety of answers. The way I would do it is to do a T chart X on one side and Y on the other. For example 
X|Y
 1|5
 2|4
 3|3
 4|2
 5|1
-1|7
And so on... Graphing each one by going left or right for X and Up or down for Y.