9.

(2, 2), quadrant I $(3,-1),$ quadrant IV $(-1,0),$ x-axis $(-2,-5),$ quadrant III (0, 0), origin $(-7,4),$ quadrant II (0, 3), y-axis $(-4,2),$ quadrant II

11.

1. On the y-axis

2. Vertical line intersecting the x-axis at $-1$

13.

1. $y>0$

2. $y<0$

3. $x<0$

4. $x>0$

15.

1. 4

2. (2, 3)

17.

1. $\sqrt{13}$

2. $(0.5,-4)$

19.

1. $4\sqrt{5}$

2. $(1,-2.5)$

21.

1. 1

2. $(\sqrt{2},4.5)$

23.

1. $\sqrt{2}|t-k|$

2. $({\displaystyle \frac{t+k}{2}},{\displaystyle \frac{t+k}{2}})$

25. Yes

27. Yes

29. Yes

31. No

33. $(-3,2),(-2,4),(-1,6)$

35. Isosceles

37. Scalene

39. Scalene

41. Equilateral

43. $d(P,R)=d(Q,S)=17\sqrt{2}$

45. $-2\text{ or }6$

47. $\left(-{\displaystyle \frac{8}{7}},0\right)$