U cant, its imposiible man
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two ways : 1. calculate the slope of the two lines, if it is same, they are parallel. 2. draw a perpendicular line ( 90 degrees) from on of the lines and if it intersects the other line at 90degrees then they are parallel -HD
If you can find the slope of both lines, then yes you can tell. The slope for parallel lines is the same - so if your slopes are the same, your lines are parallel. If you are measuring (less exact) the lines will be the same distance apart everywhere.
postulate theorems tell that the lines are parallel, but the converse if asking you to find if the lines are parallel.
Parallel, Perpendicular, and Planes.
the answer is parallel lines