Prove that the lines

Prove that the lines and intersect each other and find the point of their intersection.
Answer
Given: The equations of the two lines are and
To Prove: The two lines intersect and to find their point of intersection.
Formula Used: Equation of a line is
Vector form:
Cartesian form: .
where is a point on the line and is the direction ratios of the line.
Proof:
Let

x–41=y+31=z+17=λ1x–11=y+1–3=z+108=λ2
\begin{array}{l}
\frac{x-4}{1}=\frac{y+3}{1}=\frac{z+1}{7}=\lambda_{1} \\
\frac{x-1}{\sqrt{1}}=\frac{y+1}{-3}=\frac{z+10}{8}=\lambda_{2}
\end{array}

So a point on the first line is
A point on the second line is
If they intersect they should have a common point.

λ1+4=2λ2+1⇒λ1–2λ2=–3…4λ1–3=–3λ2–1⇒4λ1+3λ2=2…
\begin{array}{l}
\lambda_{1}+4=2 \lambda_{2}+1 \Rightarrow \lambda_{1}-2 \lambda_{2}=-3 \ldots \\
4 \lambda_{1}-3=-3 \lambda_{2}-1 \Rightarrow 4 \lambda_{1}+3 \lambda_{2}=2 \ldots
\end{array}

Solving (1) and (2),

11λ2=14λ2=1411
\begin{array}{l}
11 \lambda_{2}=14 \\
\lambda_{2}=\frac{14}{11}
\end{array}

Therefore,
Substituting for the z coordinate, we get
and
So, the lines do not intersect.