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| PARALLEL
LINES |
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Two non-vertical lines with
slopes m1 and m2 are parallel if and only if they have the same slope,
that is, if and only if m1 = m2.
Note: All vertical lines are parallel
(no slope) and all horizontal lines are also parallel (slopes
= 0).
Each line graphed below has a slope of 2/3 thus the lines
are || and they both increase from left to right because
m > 0.
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