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Which point is correct for both the line (x+2y=6) and the line (2x+y=6)?

Answer and explanation

Correct answer: ( (2,2) )

Direct answer: option C, (2,2). A point is on both lines only if substitution gives the stated right side in both equations. For (2,2), the first expression is x+2y=2+2(2)=2+4=6. The second is 2x+y=2(2)+2=4+2=6. Therefore (2,2) is the common point and hence the intersection. Option A, (1,4), gives 1+8=9 in the first equation and 6 in the second, so it fails the first. Option B, (4,1), gives 4+2=6 in the first but 8+1=9 in the second, so it fails the second. Option C passes both checks. Option D, (3,3), gives 9 in both expressions, not 6. Thus C is the only valid answer. Always test both equations, not just one.

Related tags

Common PointIntersectionGraphical Method

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