Math Problem Statement

Give a vector parametric equation for the line through the point (−4,5,3) that is parallel to the line ⟨1−3t,−4−t,0⟩:

Solution

To find the parametric equation of a line that passes through the point (4,5,3)(-4, 5, 3) and is parallel to the line given by 13t,4t,0\langle 1 - 3t, -4 - t, 0 \rangle, follow these steps:

  1. Identify the direction vector: The parametric equation of the given line 13t,4t,0\langle 1 - 3t, -4 - t, 0 \rangle has a direction vector d=3,1,0\mathbf{d} = \langle -3, -1, 0 \rangle, which represents the direction of the line.

  2. Set up the parametric equation: A parametric equation for a line passing through a point (x0,y0,z0)(x_0, y_0, z_0) with direction vector d=a,b,c\mathbf{d} = \langle a, b, c \rangle is: r(t)=x0,y0,z0+ta,b,c\mathbf{r}(t) = \langle x_0, y_0, z_0 \rangle + t \langle a, b, c \rangle

    In this case, the point is (4,5,3)(-4, 5, 3), and the direction vector is 3,1,0\langle -3, -1, 0 \rangle.

  3. Write the parametric equation: r(t)=4,5,3+t3,1,0\mathbf{r}(t) = \langle -4, 5, 3 \rangle + t \langle -3, -1, 0 \rangle

    This simplifies to: r(t)=43t,5t,3\mathbf{r}(t) = \langle -4 - 3t, 5 - t, 3 \rangle

Thus, the parametric equation of the line is: r(t)=43t,5t,3\mathbf{r}(t) = \langle -4 - 3t, 5 - t, 3 \rangle

Do you have any questions, or would you like more details?

Here are some related questions:

  1. How do you find the parametric equation of a line given two points?
  2. What is the vector equation of a line, and how does it differ from the parametric form?
  3. How do you calculate the angle between two lines using their direction vectors?
  4. What does it mean geometrically for two lines to be parallel in 3D space?
  5. How do you find the point of intersection between two lines in space?

Tip: Always check the direction vector to confirm whether lines are parallel, perpendicular, or skew.

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Math Problem Analysis

Mathematical Concepts

Vector Geometry
Parametric Equations
3D Coordinate Geometry

Formulas

Parametric equation of a line: r(t) = ⟨x_0, y_0, z_0⟩ + t⟨a, b, c⟩
Direction vector: ⟨a, b, c⟩

Theorems

Two lines are parallel if their direction vectors are scalar multiples of each other.

Suitable Grade Level

Grades 10-12 (High School Geometry)