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If the graph of (x+2y=7) and (3x+6y=21) is drawn, which point will be a solution?

Answer and explanation

Correct answer: ((1,3))

The direct answer is option A, (1,3). The second equation, 3x+6y=21, is exactly three times the first equation x+2y=7. Therefore both equations represent the same line, and every point on x+2y=7 is a solution. Test option A: 1+2(3)=1+6=7, so it lies on the common line. Option B, (3,1), gives 3+2=5, not 7. Option C, (7,1), gives 7+2=9, not 7. Option D, (2,2), gives 2+4=6, not 7. Although the equations have infinitely many common points, among the listed choices only option A is on the line. A graphical solution means a common point, not necessarily a unique point. Memory cue: if one equation is a multiple of the other, check the point in just one equation, but it must satisfy it exactly.

Related tags

Graphical MethodCoincident LinesSolution PointVerification

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