yes they can be parallel because for a pair of lines to be parallel the slope must be the same no matter if the slope is positive or negative.
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Parallel lines have the same slope.
Two linear equations that are parallel with have the sameslope, or the m value in y = mx + b will be the same.For example, y = 3x + 5 is parallel to y = 3x - 6
If they are set next to each other and never cross.Edit by Gamerkid26:_________________ Those two lines are parallel.// Those two lines are also parallel.So are those two.\\ And those two./\ These lines are NOT parallel.======================
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A trapezium is a quadrilateral with two parallel lines.