Mathematics
Two non-vertical lines with slopes m1 and m2 are parallel to each other, if:
m1m2 = 1
m1m2 = –1
m1 = –m2
m1 = m2
Straight Line Eq
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Answer
Two distinct non-vertical lines are parallel if and only if their slopes are equal.
m1 = m2
Hence, option 4 is the correct option.
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