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If a point is reflected in the y-axis, the new co-ordinates of (a, b) become
A(-a, -b)
B(a, -b)
C(-a, b)
D(b, a)
Answer & Solution
Correct answer: C. (-a, b)
1. Reflection in y-axis flips the sign of the x-coordinate.
2. y stays the same.
3. So (a, b) becomes (-a, b).
4. Hence option A is correct.
_Source: Selina Concise Mathematics Class 9, Ch 26 Co-ordinate Geometry (Mistral OCR'd PDF), section on reflection_
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