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Which of the following conditions gives no solution?

Answer and explanation

Correct answer: (a_1/a_2=b_1/b_2 \ne c_1/c_2)

The direct answer is option A. Write the pair as a_1x+b_1y+c_1=0 and a_2x+b_2y+c_2=0. No solution occurs when the two lines are distinct and parallel. The condition is a_1/a_2=b_1/b_2 but c_1/c_2 is different. Equal first two ratios mean the x- and y-coefficients have the same proportionality, so the slopes are equal. A different constant ratio means the lines are not the same line; therefore they never meet. Option A is exactly this condition. Option B, a_1/a_2≠b_1/b_2, normally indicates unequal slopes, so the lines intersect at one point and there is one solution. Option C, all three ratios equal, indicates coincident lines and infinitely many solutions. Option D says only that the second and third ratios differ; without knowing the first ratio, this alone does not guarantee no solution. Thus it is not a sufficient general condition. Memory cue: equal coefficient ratios but unequal constant ratio means parallel distinct lines: no solution.

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Linear EquationsConditionNo Solution

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