1. What is a system of parametric equations?
2. Some examples of a third parameter are time, length, speed, and scale. Explain when time is used as a parameter.
3. Explain how to eliminate a parameter given a set of parametric equations.
4. What is a benefit of writing a system of parametric equations as a Cartesian equation?
5. What is a benefit of using parametric equations?
6. Why are there many sets of parametric equations to represent on Cartesian function?
For the following exercises, eliminate the parameter tt to rewrite the parametric equation as a Cartesian equation.
7. {x(t)=5−ty(t)=8−2t{x(t)=5−ty(t)=8−2t
8. {x(t)=6−3ty(t)=10−t{x(t)=6−3ty(t)=10−t
9. {x(t)=2t+1y(t)=3√t{x(t)=2t+1y(t)=3√t
10. {x(t)=3t−1y(t)=2t2{x(t)=3t−1y(t)=2t2
11. {x(t)=2ety(t)=1−5t{x(t)=2ety(t)=1−5t
12. {x(t)=e−2ty(t)=2e−t{x(t)=e−2ty(t)=2e−t
13. {x(t)=4log(t)y(t)=3+2t{x(t)=4log(t)y(t)=3+2t
14. {x(t)=log(2t)y(t)=√t−1{x(t)=log(2t)y(t)=√t−1
15. {x(t)=t3−ty(t)=2t{x(t)=t3−ty(t)=2t
16. {x(t)=t−t4y(t)=t+2{x(t)=t−t4y(t)=t+2
17. {x(t)=e2ty(t)=e6t{x(t)=e2ty(t)=e6t
18. {x(t)=t5y(t)=t10{x(t)=t5y(t)=t10
19. {x(t)=4costy(t)=5sint{x(t)=4costy(t)=5sint
20. {x(t)=3sinty(t)=6cost{x(t)=3sinty(t)=6cost
21. {x(t)=2cos2ty(t)=−sint{x(t)=2cos2ty(t)=−sint
22. {x(t)=cost+4y(t)=2sin2t{x(t)=cost+4y(t)=2sin2t
23. {x(t)=t−1y(t)=t2{x(t)=t−1y(t)=t2
24. {x(t)=−ty(t)=t3+1{x(t)=−ty(t)=t3+1
25. {x(t)=2t−1y(t)=t3−2{x(t)=2t−1y(t)=t3−2
For the following exercises, rewrite the parametric equation as a Cartesian equation by building an x-yx-y table.
26. {x(t)=2t−1y(t)=t+4{x(t)=2t−1y(t)=t+4
27. {x(t)=4−ty(t)=3t+2{x(t)=4−ty(t)=3t+2
28. {x(t)=2t−1y(t)=5t{x(t)=2t−1y(t)=5t
29. {x(t)=4t−1y(t)=4t+2{x(t)=4t−1y(t)=4t+2
For the following exercises, parameterize (write parametric equations for) each Cartesian equation by setting x(t)=tx(t)=t or by setting y(t)=ty(t)=t.
30. y(x)=3x2+3y(x)=3x2+3
31. y(x)=2sinx+1y(x)=2sinx+1
32. x(y)=3log(y)+yx(y)=3log(y)+y
33. x(y)=√y+2yx(y)=√y+2y
For the following exercises, parameterize (write parametric equations for) each Cartesian equation by using x(t)=acostx(t)=acost and y(t)=bsinty(t)=bsint. Identify the curve.
34. x24+y29=1x24+y29=1
35. x216+y236=1x216+y236=1
36. x2+y2=16x2+y2=16
37. x2+y2=10x2+y2=10
38. Parameterize the line from (3,0)(3,0) to (−2,−5)(−2,−5) so that the line is at (3,0)(3,0) at t=0t=0, and at (−2,−5)(−2,−5) at t=1t=1.
39. Parameterize the line from (−1,0)(−1,0) to (3,−2)(3,−2) so that the line is at (−1,0)(−1,0) at t=0t=0, and at (3,−2)(3,−2) at t=1t=1.
40. Parameterize the line from (−1,5)(−1,5) to (2,3)(2,3) so that the line is at (−1,5)(−1,5) at t=0t=0, and at (2,3)(2,3) at t=1t=1.
41. Parameterize the line from (4,1)(4,1) to (6,−2)(6,−2) so that the line is at (4,1)(4,1) at t=0t=0, and at (6,−2)(6,−2) at t=1t=1.
For the following exercises, use the table feature in the graphing calculator to determine whether the graphs intersect.
42. {x1(t)=3ty1(t)=2t−1 and {x2(t)=t+3y2(t)=4t−4{x1(t)=3ty1(t)=2t−1 and {x2(t)=t+3y2(t)=4t−4
43. {x1(t)=t2y1(t)=2t−1 and {x2(t)=−t+6y2(t)=t+1{x1(t)=t2y1(t)=2t−1 and {x2(t)=−t+6y2(t)=t+1
For the following exercises, use a graphing calculator to complete the table of values for each set of parametric equations.
44. {x1(t)=3t2−3t+7y1(t)=2t+3{x1(t)=3t2−3t+7y1(t)=2t+3
tt | xx | yy |
---|---|---|
–1 | ||
0 | ||
1 |
45. {x1(t)=t2−4y1(t)=2t2−1{x1(t)=t2−4y1(t)=2t2−1
tt | xx | yy |
---|---|---|
1 | ||
2 | ||
3 |
46. {x1(t)=t4y1(t)=t3+4{x1(t)=t4y1(t)=t3+4
tt | xx | yy |
---|---|---|
-1 | ||
0 | ||
1 | ||
2 |
47. Find two different sets of parametric equations for y=(x+1)2y=(x+1)2.
48. Find two different sets of parametric equations for y=3x−2y=3x−2.
49. Find two different sets of parametric equations for y=x2−4x+4y=x2−4x+4.
Candela Citations
- Precalculus. Authored by: Jay Abramson, et al.. Provided by: OpenStax. Located at: http://cnx.org/contents/fd53eae1-fa23-47c7-bb1b-972349835c3c@5.175:1/Preface. License: CC BY: Attribution. License Terms: Download for free at: http://cnx.org/contents/fd53eae1-fa23-47c7-bb1b-972349835c3c@5.175:1/Preface