To solve \(x + 3y = 7\) and \(2x - y = 0\) by Cramer’s rule, the value of \(D\) is ____.

A. 7

B. 5

C. −5

D. −7

Doubtly Asked 29 Oct 2026 Practice test ssc 10th Save WhatsApp Report

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Answer: (d) −7

\(D = \begin{vmatrix} 1 & 3 \\ 2 & -1 \end{vmatrix} = (1)(-1) - (3)(2) = -1 - 6 = -7\).

Doubtly AI · 29 Oct 2026 AI-verified · Nov 2026 Report

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