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11 August, 06:40

Is the line y = 3x - 7 parallel or perpendicular to 3x + 9y = 9? Explain your answer.

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  1. 11 August, 10:05
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    Y = 3x - 7 ... slope here is 3 and y int is - 7

    3x + 9y = 9

    9y = - 3x + 9

    y = - 1/3x + 1 ... slope here is - 1/3 and y int is 1

    the slopes 3 and - 1/3 are negative reciprocals of each other ... therefore, ur lines are perpendicular
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