SOLUTION: 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. cen

Question 320677: 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
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Let solve for the intersection point.
1.
2.
Add the equations together,

Then use either equation to find y.

.
.
.
b) is the correct answer.
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