Equation if points are satisfactory

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Calpalned
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Homework Statement


Screenshot (52).png


Homework Equations



n/a

The Attempt at a Solution


How was A+B = 0 derived? Is this a general definition?
 
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SammyS said:
They used substitution.
I'm sorry, I don't quite get that.
What was substituted? Are they saying y = 0?
 
I overlooked the word "origin", but now it makes sense. Thanks