Its ethical an immeasurable edge, fair?
WRONG.
take
-x + y = 0
This is the edge washing one’s hands of the launch, forming the edge y = x.
1. mostly Does this edge from a info?
2.
The principal to 2.: mostly The peek edge is x - y = 0. mostly Is there another edge with a unalike equation that DESCRIBES THE SAME LINE?
Yes there is, to the blemished inquiry, and YES IT DOES, to the come in initially inquiry.

That edge is EXACTLY the changeless as -x + y = 0, barely it “points” in the contrasting info.
So which “way” is -x + y pointing, and which course of action is x - y = 0 pointing?
Well, I’ll state you.
x - y = 0 points “down and to the left”
-x + y = 0 points “up and to the right”
the aim in promoter of this is unchecked when you utilize vectors and the equations
A = y1 - y2
B = x2 - x1
C = x1y2 - x2y1
Then, if you utilize the points
P1 = (1,1)
P2 = (0,0)
You learn the equation
A = 1 - 0 = 1
B = 0 - 1 = -1
C = 0
Then
x - y = 0
POINTS DOWN AND LEFT!!
And so, the contrasting equation
-x + y = 0
POINTS UP AND RIGHT!!
On the “left side” of a edge is +
On the “right side” of a edge is -
Taking the anyone that goes up and fair:
plug in ( 2, 0 )
-x + y = 0
-2 + 0 = -2
So, (2,0) is contrary in that edge equation, discrimination (2,0) is “right” of -x + y = 0
Taking (-2,0)
2 + 0 = 2
so, (-2,0) is “left” of -x + y = 0
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