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Question 6 Given the linear equation 2x + 3y − 8 = 0, write another linear equations in two variables such that the geometrical representation of the pair so formed is: (i) intersecting lines (ii) parallel lines (iii) coincident lines

Class 10 - Math - Pair of Linear Equations in Two Variables Page 50

Answers

Answered by nikitasingh79
331
Graphical Method of solving pair of linear equations in two variables

The general form for a pair of linear equations in two variables x and y is 
a1x + b1y + c1 = 0 ,
a
2x + b2y + c2 = 0 , 

Where a
1, a2, b1, b2, c1, c2 are all real numbers ,a1²+ b1² ≠ 0 & a2² + b2² ≠ 0.


Condition 1: Intersecting Lines
If   a 1 / a 2 ≠  b 1 / b 2  , then the pair of linear equations has a unique solution.

Condition 2: Coincident Lines
If   a 1 / a 2 =  b 1 / b 2 =  c 1 / c 2  ,then the pair of linear equations has infinite solutions.

A pair of linear equations, which has a unique or infinite solutions are said to be a consistent pair of linear equations.

A pair of linear equations, which has  infinite many distinct common solutions are said to be a consistent pair or dependent pair of linear equations.

Condition 3: Parallel Lines
If   a 1/ a 2 =  b 1/  b 2 ≠  c 1 / c 2 , then a pair of linear equations   has no solution.

A pair of linear equations which has no solution is said to be an inconsistent pair of linear equations.

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Solution:

Given:  

2x+3y-8=0...........................................(i)

i) For intersecting lines, a1 /a2 ≠ b1/b2

∴ Any line intersecting with eq i may be taken as 

3x +2y -9=0    or       3x+2y -7 =0


ii) For parallel lines ,  a1 /a2 = b1/b2 ≠ c1/ c2

∴ Any line parallel with eq i may be taken as 

6x +9y +7=0    or       2x+3y -12 =0



iii) For coincident lines, a1 /a2= b1/b2 =c1/c2

∴ Any line coincident with eq i may be taken as 

4x +6y -16=0    or       6x+9y -24 =0

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Hope this will help you....
Answered by TrapNation
235

(i) Intersecting lines:
For this condition,
a1/a2 ≠ b1/b2
The second line such that it is intersecting the given line is
2x + 4y - 6 = 0 as
a1/a2 = 2/2 = 1
b1/b2 = 3/4 and
a1/a2 ≠ b1/b2

(ii) Parallel lines

For this condition,

a1/a2 = b1/b2 ≠ c1/c2
Hence, the second line can be
4x + 6y - 8 = 0 as
a1/a2 = 2/4 = 1/2
b1/b2 = 3/6 = 1/2 and
c1/c2 = -8/-8 = 1
and a1/a2 = b1/b2 ≠ c1/c2

(iii) Coincident lines
For coincident lines,
a1/a2 = b1/b2 = c1/c2
Hence, the second line can be
6x + 9y - 24 = 0 as
a1/a2 = 2/6 = 1/3
b1/b2 = 3/9 = 1/3 and
c1/c2 = -8/-24 = 1/3
and a1/a2 = b1/b2 = c1/c2
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