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Which pair of equations will give a unique solution on the graph?

Answer and explanation

Correct answer: x + 2y = 7 and 2x + y = 8

A pair has a unique graphical solution when its two lines intersect at exactly one point. For option C, compare the coefficients: a₁/a₂ = 1/2, whereas b₁/b₂ = 2/1 = 2. Since these ratios are unequal, the lines have different slopes and therefore meet once. Option A represents the same line because the first equation is twice the second, so it has infinitely many solutions. In option B, the x- and y-coefficients are proportional but the constants are not: the lines are parallel and there is no solution. In option D, the first equation is three times the second, so the lines coincide. Hence C is the only correct choice.

Related tags

Unique-SolutionCoefficient-RatioIntersecting-LinesGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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