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Which one of the following pair of linear equations is/are inconsistent?

(A) 2x – 2y = 10, 3x – 3y = 15

(B) 3x – y = 7, 6x – 2y = 18

(C) x – y =15, 5x – 5y = 12

(D) 7x – 3y = 3, 14x – 6y = 8

Choose the correct answer from the options given below:

Solution

✅ Correct Option: 4

A pair is inconsistent when a1a2=b1b2≠c1c2\frac{a_1}{a_2}=\frac{b_1}{b_2}\neq\frac{c_1}{c_2}.

(A) 23=23=1015\frac{2}{3}=\frac{2}{3}=\frac{10}{15}, so all three ratios are equal: consistent with infinite solutions.

(B) 12=12≠718\frac{1}{2}=\frac{1}{2}\neq\frac{7}{18}: inconsistent.

(C) 15=15≠1512\frac{1}{5}=\frac{1}{5}\neq\frac{15}{12}: inconsistent.

(D) 12=12≠38\frac{1}{2}=\frac{1}{2}\neq\frac{3}{8}: inconsistent.

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