Asked in: July 2024 and July 2025 board papers (same values); March 2026 board paper with \(D_x = -42\), \(D = -3\)For simultaneous equations in variables \(x\) and \(y\), \(D_x = 49\), \(D_y = -63\), \(D = 7\), then find the value of \(x\).

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

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Answer: \(x = 7\)

By Cramer’s rule, \(x = \dfrac{D_x}{D} = \dfrac{49}{7} = 7\).

(Similarly \(y = \dfrac{D_y}{D} = \dfrac{-63}{7} = -9\). In March 2026: \(x = \dfrac{-42}{-3} = 14\).)

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

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