Algebra

Determine whether the lines are parallel, perpendicular, or neither.

y = 9x + 9 and y = -9x + 9

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  1. in y = mx + b, the slop is m

    for parallel lines the slopes must be the same
    for perpendicular lines the slopes are negative reciprocals of each other.

    I see the first slope as +9 and the second as -9

    so which fits?

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  2. perpendicular

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  3. no, its neither

    to be perpendicular, if one is +9 the other would have to be - 1/9

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