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Which point is obtained from the intersection of the lines (2x+3y=12) and (x+y=5)?

Answer and explanation

Correct answer: ((3,2))

The direct answer is option A: the intersection is (3,2). Solve the two boundary equations together. The second equation is x + y = 5. Multiply it by 2 to obtain 2x + 2y = 10. Subtract this from the first equation, 2x + 3y = 12: the result is y = 2. Put y = 2 into x + y = 5: x + 2 = 5, so x = 3. Therefore the intersection is (3,2). Check it in both equations: 2(3) + 3(2) = 12 and 3 + 2 = 5. Option A satisfies both. Option B, (1,4), gives 14 in the first equation. Option C, (4,1), gives 11 in the first equation. Option D, (2,3), gives 13 in the first equation. Thus the other points cannot be the intersection. Memory cue: an intersection point must satisfy every boundary equation simultaneously.

Related tags

IntersectionCorner PointBoundary Lines

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