Geometryhard · Past Paper
If (x, y) is equidistant from (1, 2) and (3, 4), then:
Ax + y = 5
Bx - y = 5
Cx + y = 10
D2x + 2y = 10
✓ Correct Answer: A — x + y = 5
(x-1)^2 + (y-2)^2 = (x-3)^2 + (y-4)^2 => -2x+1-4y+4 = -6x+9-8y+16 => 4x+4y=20 => x+y=5.
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