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8. 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. (1 point) No; one line has zero slope, the other has no slope. Yes; the lines are both vertical. Yes; the lines have equal slopes. No; the lines have unequal slopes. 10. Plans for a bridge are drawn on a coordinate grid. One girder of the bridge lies on the line y = –9x – 9. A perpendicular brace passes through the point (–1, 7). Write an equation of the line that contains the brace. (1 point) y – 1 = –(x + 7) x – 7 = –9(y + 1) y – 7 = (x + 1) y – 7 = –9(

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Yes; the lines have equal slopes

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