Question 551115: Which two lines are parallel?
A. 5y = –3x – 5
B. 5y = –5 – 3x
C. 3y – 2x = –1
Is the line through points P(–7, 2) and Q(7, –6) parallel to the line through points R(–1, –5) and S(–3, –1)? Explain.
Answer by Alan3354(69443)   (Show Source):
You can put this solution on YOUR website! Which two lines are parallel?
A. 5y = –3x – 5
B. 5y = –5 – 3x
C. 3y – 2x = –1
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A & B are the same equation. Not parallel, but coincident.
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Is the line through points P(–7,2) and Q(7,–6) parallel to the line through points R(–1,–5) and S(–3,–1)? Explain.
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Find the slope of each pair.
Slope, m = diffy/diffx
For P & Q, = (2 - (-6))/(-7 - 7) = 8/-14
m = -4/7
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Find the slope for R & S.
If the slope is the same, they're parallel.
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