geometry

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. Which of the following circles would show the locus of points in a plane 1 unit from the intersection of the lines x + y = 2 and x – y = 4?

a. center (4, 2), radius = 1
b. center (3, –1), radius = 1
c. center (3, 1), radius = 1
d. center (0, 0), radius = 1

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