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What will be the graph of the equations (3x+8y=27) and (9x+24y=81)?

Answer and explanation

Correct answer: Same line

Compare the second equation with the first. Multiplying 3x+8y=27 by 3 gives 9x+24y=81, exactly the second equation. Since multiplication by a nonzero constant does not change the solutions, both equations describe the same relationship between x and y.

Consequently, their graphs are not two different lines. They lie on top of one another and have infinitely many common points. Therefore option B, one same line, is correct. Two distinct parallel lines would have proportional coefficients but different proportional constants; here every term, including the right-hand side, has been multiplied by 3.

Related tags

Linear EquationsHardGraphCoincident Lines

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