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Simultaneous Equations for a System

X^2 + y^2 = 1

y=|x| - a find all "a" which prevent the system to have no solutions

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Please see the attached file.

x2 + y2 = 1
y = |x| - a f

Find all "a" which prevent the system to have no solutions

From the second ...

Solution Summary

The solution solves the system so that there is no solutions.

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