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Find the parametric equation of line AB and the Cartesian equation of line d.

Mathematics

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Answer

(AB):{x=1−3my=3m(AB): \begin{cases} x = 1 - 3m \\ y = 3m \end{cases}

(d):2x+y−5=0(d): 2x+y-5=0

Step-by-step solution

2 steps
  1. Find the parametric equation of line $(AB)$.

    The coordinates of points AA and BB are A(1,0)A(1,0) and B(−2,3)B(-2,3).
    First, find the direction vector AB⃗\vec{AB}.

    AB⃗=(xB−xA,yB−yA)=(−2−1,3−0)=(−3,3)\vec{AB} = (x_B - x_A, y_B - y_A) = (-2 - 1, 3 - 0) = (-3, 3)

    The parametric equation of a line passing through a point (x0,y0)(x_0, y_0) with a direction vector (u,v)(u,v) is given by:

    {x=x0+t⋅uy=y0+t⋅v\begin{cases} x = x_0 + t \cdot u \\ y = y_0 + t \cdot v \end{cases}

    Using point A(1,0)A(1,0) and the direction vector AB⃗=(−3,3)\vec{AB}=(-3,3), and letting the parameter be tt:

    {x=1+t(−3)y=0+t(3)\begin{cases} x = 1 + t(-3) \\ y = 0 + t(3) \end{cases} {x=1−3ty=3t\begin{cases} x = 1 - 3t \\ y = 3t \end{cases}

    The student used mm as the parameter, which is also acceptable.

    (AB):{x=1−3my=3m\boxed{(AB): \begin{cases} x = 1 - 3m \\ y = 3m \end{cases}}
  2. Find the Cartesian equation of line $(d)$.

    The line (d)(d) is given by the parametric equations:

    {x=m+1(1)y=−2m+3(2)\begin{cases} x = m+1 \quad (1) \\ y = -2m+3 \quad (2) \end{cases}

    From equation (1), express mm in terms of xx:

    m=x−1m = x-1

    Substitute this expression for mm into equation (2):

    y=−2(x−1)+3y = -2(x-1)+3 y=−2x+2+3y = -2x+2+3 y=−2x+5y = -2x+5

    To write the equation in the standard Cartesian form ax+by+c=0ax+by+c=0, move all terms to one side:

    2x+y−5=02x+y-5 = 0

    The student's work for this part is correct.

    (d):2x+y−5=0\boxed{(d): 2x+y-5=0}
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