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Why does the point ((2,4)) lie on the graph (y=x^2)?

Answer and explanation

Correct answer: Because (4=2^2)

The direct answer is A: the point lies on the graph because \\(4=2^2\\). A point \\((x,y)\\) is on the graph \\(y=x^2\\) exactly when its coordinates satisfy that equation. Substitute x=2: the right side is \\(2^2=4\\), which equals the given y-coordinate. Therefore \\((2,4)\\) is on the graph. A is correct. Option B says \\(2=4^2\\), but \\(4^2=16\\), not 2, and it reverses the required substitution. Option C says \\(4=2+2\\), which is numerically true but is not the graph equation \\(y=x^2\\); a true unrelated statement does not prove graph membership. Option D says \\(2=4-2\\), also numerically true but irrelevant to the equation. The reliable method is always to substitute both coordinates into the actual equation, not merely find any true relation between them.

Related tags

Relations-FunctionsStandard-GraphsPoint-Checking

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