Determine, algebraically, the vertices of the triangle formed by the lines
$3 x-y=3$
$2 x-3 y=2$
$x+2 y=8$
Given:
$3 x-y=3$
$2 x-3 y=2$
$x+2 y=8$
To do:
We have to find the vertices of the triangle formed by the given lines.
Solution:
$3 x-y-3=0$......(i)
$2 x-3 y-2=0$........(ii)
$x+2 y-8=0$.............(iii)
Let the lines given by (i), (ii) and (iii) represent the sides of a $\triangle ABC$ respectively.
Solving (i) and (ii), we get the intersection point $B$.
Multiplying (i) by 3 and subtracting (ii) from it, we get,
$3(3x)-3(y)-3(3)-(2x-3y-2)=0$
$9x-2x-3y+3y-9+2=$
$7x=7$
$x=1$
Substituting $x=1$ in (i), we get,
$3(1)-y-3=0$
$y=0$
This implies,
The coordinates of the vertex $B$ is $(1,0)$
Similarly,
$2\times$ (iii) $-$ (ii), we get,
$2x+4y-16-(2x-3y-2)=0$
$7y=14$
$y=2$
Substituting $y=2$ in (ii), we get,
$2x-3(2)-2=0$
$2x=8$
$x=4$
The coordinates of the vertex $C$ is $(4,2)$
$2\times$ (i) $+$ (iii), we get,
$6x-2y-6+x+2y-8=0$
$7x=14$
$x=2$
Substituting $x=2$ in (iii), we get,
$2+2y-8=0$
$2y=6$
$y=3$
The coordinates of the vertex $A$ is $(2,3)$
Hence, the vertices of the triangle formed by the given lines are $(2, 3), (1, 0)$ and $(4,2)$.
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