If two or more lines are said to be parallel to one another, it means that they never intersect and that they have identical slopes. If they are expressed as equations (in the format y = mx + b), then you simply look to see if the value for m is the same for both.
For example, the following lines would all be parallel to one another:
y = 4x + 5
y = 4x + 8
y = 4x - 3
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Two sets of parrall sides
They look like two intersecting lines that make four right angles. Like the two lines in this L.
like this^
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They are just straight lines that is a 90* angle.