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Which of the following pairs is consistent and independent?

Answer and explanation

Correct answer: (x+3y=8) and (2x+5y=11)

The direct answer is D. A consistent and independent pair has exactly one solution, so its two lines must intersect at one point. For equations a1x+b1y=c1 and a2x+b2y=c2, this happens when a1/a2 is not equal to b1/b2. In A, 1/2=1/2, so the equations are the same line and have infinitely many solutions. In B, 2/4=3/6 but 7/15 is different, so the lines are parallel and inconsistent; there is no solution. In C, 3/6=1/2 and 1/2=1/2, so the equations are the same line and have infinitely many solutions. In D, 1/2 is not equal to 3/5, so the lines intersect once and the pair is consistent and independent. Memory cue: unequal coefficient ratios mean one unique solution.

Related tags

Linear EquationsMcqConsistent Independent

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