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March 30, 2017

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Determine whether the lines are parallel, perpendicular, or neither.
y = 9x + 9 and y = -9x + 9

Is this perpendicular since they go across from each other

  • Algebra - ,

    The answer is neither. For the lines to be perpendicular, the product of the slopes, which are coefficients of the "x" terms, must be -1. In this case the product is -81.

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