Do the following equations represent a pair of coincident lines? Justify your answer.

(i) and 7x + 3y = 7


(ii) - 2x - 3y = 1 and 6y + 4x = - 2


(iii)


Condition for coincident lines,

a1/a2 = b1/b2 = c1/c2;


(i) No.


Given pair of linear equations


and 7x + 3y = 7


Comparing with ax + by + c = 0;


Here, a1 = 3, b1 = 1/7, c1 = - 3;


And a2 = 7, b2 = 3, c2 = - 7;


a1 /a2 = 3/7


b1 /b2 = 1/21


c1 /c2 = - 3/ - 7 = 3/7


Here, a1/a2 b1/b2.


Hence, the given pair of linear equations has unique solution.


(ii) Yes, given pair of linear equations.


- 2x - 3y - 1 = 0 and 4x + 6y + 2 = 0;


Comparing with ax + by + c = 0;


Here, a1 = - 2, b1 = - 3, c1 = - 1;


And a2 = 4, b2 = 6, c2 = 2;


a1 /a2 = - 2/4 = - 1/2


b1 /b2 = - 3/6 = - 1/2


c1 /c2 = - 1/2


Here, a1/a2 = b1/b2 = c1/c2, i.e. coincident lines


Hence, the given pair of linear equations is coincident.


(ii) No, given pair of linear equations are


and = 0


Comparing with ax + by + c = 0;


Here, a1 = 1/2, b1 = 1, c1 = 2/5;


And a2 = 4, b2 = 8, c2 = 5/16;


a1 /a2 = 1/8


b1 /b2 = 1/8


c1 /c2 = 32/25


Here, a1/a2 = b1/b2 c1/c2, i.e. parallel lines


Hence, the given pair of linear equations has no solution.


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