Asked by Kate

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

y = 9x + 9 and y = -9x + 9
Answered by Reiny
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?
Answered by Carmen
perpendicular
Answered by Reiny
no, its neither

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