Hey! To graph this, I’m pretty sure you must rewrite this in slope- intercept form. So, instead of x-y=6, you need to move the x to the other side. So the new equation should be: -y= -x + 6, but you can’t have a negative y value. So, you must multiply the whole equation by -1. After you do that, the equation should be: y=x-6. To graph this, you would start at -6. The x value is the slope and since it is written as “x”, you need to remember that x is actually 1x. so you would start at -6 and go up 1 and over one.
I hope that this helps somewhat :)