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Which condition is correct for the equations (13x+8y=49) and (26x+16y=r) to be inconsistent?

Answer and explanation

Correct answer: (r\ne98)

The direct answer is option B: r≠98. Compare the equations 13x+8y=49 and 26x+16y=r. The coefficients of x and y in the second equation are twice those in the first: 26/13=2 and 16/8=2. For the two lines to be the same, the constant must also be doubled, so r must equal 2×49=98. If r=98, the equations are coincident and have infinitely many solutions, not inconsistent. Therefore inconsistency requires r≠98: the coefficients remain proportional but the constants do not, producing distinct parallel lines with no common solution. Option A describes the coincident case. Option C and option D are merely particular values of r; they are inconsistent only because neither equals 98, but they do not state the complete condition. The exact answer is the inequality r≠98.

Related tags

Linear EquationsExpertInconsistentParameter

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