parellel lines
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parallel
A straight line is one which travels in exactly one direction, never bending or curving.
parallel lines
To make it simple, it is because the line has no slope. There is no angle, it is just a straight line. When the line is completely vertical, it means that there is no y-intercept, because the line will never cross the y-intercept. So, because the slope is not there, then it shall be "0" (zero)
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