Title: Lesson 13
Course: quiz duplicate error

Q: Is the line through points P(0, 5) and Q(–1, 8) parallel to the line through points R(3, 3) and S(5, –1)? Explain.
- No, the lines have unequal slopes.
- Yes; the lines are both vertical.
- Yes; the lines have equal slopes.
- No, one line has slope, the other has no slope.
A: No, the lines have unequal slopes.

Q: Is the line through points P(8, –3) and Q(3, –4) parallel to the line through points R(–2, –5) and S(1, 5)? Explain.
- No, one line has slope, the other has no slope.
- Yes; the lines have equal slopes.
- No, the lines have unequal slopes.
- Yes; the lines are both vertical.
A: No, the lines have unequal slopes.

Q: Is the line through points P(–2, 8) and Q(9, –2) parallel to the line through points R(–5, 4) and S(3, –2)? Explain.
- No, the lines have unequal slopes.
- Yes; the lines have equal slopes.
- Yes; the lines are both vertical.
- No, one line has slope, the other has no slope.
A: No, the lines have unequal slopes.

Q: Is the line through points P(7, 5) and Q(8, –9) parallel to the line through points R(1, –2) and S(–1, 3)? Explain.
- No, the lines have unequal slopes.
- Yes; the lines are both vertical.
- No, one line has slope, the other has no slope.
- Yes; the lines have equal slopes.
A: No, the lines have unequal slopes.

Q: Is the line through points P(0, –9) and Q(2, –8) perpendicular to the line through points R(1, 4) and S(3, 3)? Explain.
- Yes; their slopes are equal.
- Yes; their slopes have product –1
- No, their slopes are not reciprocals.
- Yes; their slopes have product –1
A: No, their slopes are not reciprocals.

Q: Is the line through points P(4, 8) and Q(–4, 16) perpendicular to the line through points R(0, 5) and S(–8, –3)? Explain.
- Yes; their slopes are equal.
- Yes; their slopes have product –1
- Yes; their slopes have product –1
- No, their slopes are not reciprocals.
A: Yes; their slopes have product –1 / Yes; their slopes have product –1

Q: Is the line through points P(5, –5) and Q(4, –13) perpendicular to the line through points R(–3, –2) and S(–11, –1)? Explain.
- Yes; their slopes have product –1
- Yes; their slopes are equal.
- No, their slopes are not opposite reciprocals.
- No, their slopes are not reciprocals.
A: Yes; their slopes have product –1

Q: Is the line through points P(6, –4) and Q(5, –11) perpendicular to the line through points R(–7, 5) and S(–14, 6)? Explain.
- No, their slopes are not opposite reciprocals.
- No, their slopes are not reciprocals.
- Yes; their slopes have product –1
- Yes; their slopes are equal.
A: Yes; their slopes have product –1

Q: What must be true about the slopes of two perpendicular lines, neither of which is vertical?
- The slopes are equal.
- The slopes have product 1.
- The slopes have product –1.
- One of the slopes must be 0.
A: The slopes have product –1.