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Mathematics · 2023 · 1 mark
CBSE 2023 · Region 5 · Set 1 · Q2
The pair of equations ax +2 y =9 and 3 x + by =18 represent parallel lines, where a, b are integers, if:
The pair of equations $\displaystyle \mathrm{ax}+2 \mathrm{y}=9$ and $\displaystyle 3 \mathrm{x}+\mathrm{by}=18$ represent parallel lines, where $\displaystyle \mathrm{a}, \mathrm{b}$ are integers, if :
Official answer
(D)
$\displaystyle \mathrm{ab}=6$
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CBSE Class 10 Mathematics past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.