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Question

Prove that the lines x+13=y+35=z+57 and x21=y43=z65 are intersecting to each other. Find their point of intersection.

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Solution

x+13=y+35=z+57 ......(i)
and x21=y43=z65 .......(ii)
Condition for coplanar, then
∣ ∣x2x1y2y1z2z1l1m1n1l2m2n2∣ ∣=0
∣ ∣2+14+36+5357135∣ ∣
=∣ ∣3711357135∣ ∣
3(2521)7(157)+11(95)
3(4)7×8+11(4)
1256+44
5656=0
Let x+13=y+35=z+57=r1
x=3r11
y=5r13
z=7r15
and from (ii) x21=y43=z65=r2
x=r2+2
y=3r2+4
z=5r2+6
3r11=r2+2
3r1r2=2+1=3 ....(i)
5r13=3r2+4
5r13r2=7 ......(ii)
3r1r2=3×5
5r13r2=7×4
____________________
15r15r2=15
15r19r2=21
- + -
____________________
4r2=6
r2=64=32,r2=32
3r1r2=3
3r1+32=3
3r1=332=32
r1=32×13=12
r1=12,r2=32
x=3r11=3×121
x=12
y=5r13
y=5123=523
y=12
z=7r15
z=7×125=725
z=32
x=12
y=12
z=32.

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