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In Cartesian co-ordinates, the two perpendicular reference lines are called

Ax-axis and y-axis
BNumber line and origin only
CVertical line and slope only
DSlope and intercept only
Answer & Solution
Correct answer: A. x-axis and y-axis
1. Section 26.1 introduces co-ordinate geometry. 2. A point is located using two perpendicular number lines. 3. These lines are the x-axis (horizontal) and y-axis (vertical). 4. So option A is correct. _Source: Selina Concise Mathematics Class 9, Ch 26 Co-ordinate Geometry (Mistral OCR'd PDF), section 26.1_
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