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Which point lies on both lines (2x+y=9) and (x-y=3)?

Answer and explanation

Correct answer: ((4,1))

The direct answer is A: (4,1). A point lies on both lines only when it satisfies both equations. Test (4,1): in 2x+y=9, 2(4)+1=8+1=9; in x−y=3, 4−1=3. Both statements are true, so (4,1) is the common point and graphical solution. Option B, (3,0), gives 2x+y=6, not 9. Option C, (5,−1), gives 2x+y=9 but x−y=6, not 3, so it lies on only one line. Option D, (2,5), gives 2x+y=9 but x−y=−3, not 3. Thus checking both equations is essential. Memory cue: a common point must pass two separate substitutions, not just one.

Related tags

Graphical MethodCommon PointIntersectionVerification

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