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Which of the following is inconsistent equation to 2x + 3y – 5 = 0 ? A) 4x – 6y – 11 = 0 B) 2x + y = 5 C) x + 3y = 5 D) 4x + 6y – 11 = 0 |
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Answer» Correct option is (D) 4x + 6y – 11 = 0 The condition for inconsistent system of equations is \(\frac{a_1}{a_2}=\frac{b_1}{b_2}\neq\frac{c_1}{c_2}.\) (A) \(\frac{a_1}{a_2}=\frac24=\frac12,\) \(\frac{b_1}{b_2}=\frac3{-6}=\frac{-1}2\) \(\because\) \(\frac{a_1}{a_2}\neq\frac{b_1}{b_2}\) \(\therefore\) System of equations is consistent. (B) \(\frac{a_1}{a_2}=\frac22=1,\) \(\frac{b_1}{b_2}=\frac3{1}=3\) \(\therefore\) \(\frac{a_1}{a_2}\neq\frac{b_1}{b_2}\) \(\therefore\) System of equations is consistent. (C) \(\frac{a_1}{a_2}=\frac21=2,\) \(\frac{b_1}{b_2}=\frac3{3}=1\) \(\therefore\) \(\frac{a_1}{a_2}\neq\frac{b_1}{b_2}\) \(\therefore\) System of equations is consistent. (D) \(\frac{a_1}{a_2}=\frac24=\frac12,\) \(\frac{b_1}{b_2}=\frac3{6}=\frac{1}2\) and \(\frac{c_1}{c_2}=\frac{-5}{-11}=\frac5{11}\) \(\therefore\) \(\frac{a_1}{a_2}=\frac{b_1}{b_2}\neq\frac{c_1}{c_2}\) \(\therefore\) System of equations is inconsistent. Hence, equation 4x + 6y – 11 = 0 is inconsistent to equation 2x + 3y - 5 = 0. Correct option is D) 4x + 6y – 11 = 0 |
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