Two lines, with slopes 'm' and 'n', are parallel to each other if ______.
A
1/m + 1/n = 1
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B
mn=0
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C
m=n
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D
m+n=0
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Solution
The correct option is C
m=n
Two non-vertical lines are parallel if and only if their slopes are equal. Hence,two lines with slopes 'm' and 'n', are parallel to each other if m = n.