Discussion

Explanation:

Two linear equations:

a₁x + b₁y + c₁ = 0 and
a₂x + b₂y + c₂ = 0

have no solution when $\frac{a_1}{a_2}=\frac{b_1}{b_2}\ne \frac{c_1}{c_2}$

∴ For the given system of equations,

$\frac{4}{6}=\frac{6}{p}\ne \frac{10}{20}$

⇒ p = 9

Hence, option (d).

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