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24 July, 15:30

Use slopes to determine if the lines 4x-7y=9 and 7x+4y=5 are perpendicular.

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  1. 24 July, 18:02
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    Perpendicular.

    Step-by-step explanation:

    4x - 7y = 9 - --> 7y = 4x - 9 - --> y = 4/7 x - 9/7, slope = 4/7

    7x + 4y = 5 - --> 4y = - 7x + 5 - --> y = - 7/4 x + 5/4, slope = - 7/4

    lopes are negative-reciprocal, so these lines are perpendicular.
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