If p, q and r are not in AP and b = c, then the line joining the points X, Y and Z is parallel to
A.y-axis✓ Correct
B.x-axis
C.y = x
D.y = −x
Explanation
Given a, b, c are in AP with b = c, so 2b = a + c = a + b, giving a = b. So a = b = c. Then X, Y, Z all have the same x-coordinate (a = b = c), meaning they lie on a vertical line. A vertical line is parallel to the y-axis.
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