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Question

If two lines having slopes m1 and m2 are parallel to each other, then which of the following is correct?

A
m1=m2
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B
m1×m2=1
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C
m1m2=2
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D
m1=3×m2
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Solution

The correct option is A m1=m2

If two straight lines are parallel only when their slopes are equal.
Slope's defined as m= tanθ=yx


If above given two lines are parallel ratio of y-intercept to x-intercept must be equal.
So, any lines parallel to y=m1x+c is of the type y=m2x+d.
m1=m2


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