# pre-calc

Two nonvertical lines have slopes m1 and m2, respectively. The lines are parallel if ___ and the ___ are unequal; the lines are perpendicular if ___.

1. 👍 1
2. 👎 1
3. 👁 1,119
1. m1 = m2

m2 = -1/m1

1. 👍 0
2. 👎 2

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