Slopes of Parallel and Perpendicular Lines
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Proving the Slope Criteria
The slope of PQ is (v-z) divided by
The slope of P'Q' is
(w + a) - (x + a).
Both lines have a slope that is
Therefore, the lines are
✓divided by
divided by
·
Q' (w+av+b)
Q (w, v)
P'(x+a, z+b)
P(x, z)