# 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. 👎
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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2. 👎

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