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What is the intersection point of (2x - y = 1) and (x + y = 8)?

Answer and explanation

Correct answer: (3, 5)

The intersection point must satisfy both equations at the same time. Check option B, (3, 5): in the first equation, 2x - y = 2(3) - 5 = 6 - 5 = 1; in the second equation, x + y = 3 + 5 = 8. Thus (3, 5) is common to both lines and option B is correct. The alternatives can be rejected by substitution: (2, 6) gives 2x - y = -2, (4, 4) gives 4, and (5, 3) gives 7, none of which equals 1 in the first equation. Although these pairs may look plausible because their coordinates add to 8 in some cases, the first equation is also required. Hence the common point is uniquely (3, 5).

Related tags

Intersection-PointSubstitutionLinear-EquationsGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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