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For infinitely many solutions of 2x + by = 6 and bx + 8y = 12, what is the value of b?

Answer and explanation

Correct answer: b = 4

Answer: C, b = 4. A pair of linear equations has infinitely many solutions when one equation is an exact multiple of the other. Compare 2x + by = 6 with bx + 8y = 12. If b = 4, the first equation becomes 2x + 4y = 6. Multiplying it by 2 gives 4x + 8y = 12, which is exactly the second equation. Thus both equations represent the same straight line, so every point on that line is a solution and there are infinitely many solutions. Option A, b = 2, gives 2x + 2y = 6 and 2x + 8y = 12, which are different lines. Option B, b = 3, also does not make all corresponding coefficients proportional. Option D, b = 6, fails for the same reason. The ratio test is a useful check: a1/a2 = b1/b2 = c1/c2. Memory cue: infinitely many solutions means coincident lines, not merely intersecting lines.

Related tags

Conditions For SolvabilityInfinitely Many SolutionsLinear EquationsCoincident LinesPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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