Q.

One equation of a pair of dependent linear equations is 5x+7y=2 . The second equation can be


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a

10x14y=4

b

10x+14y+4=0

c

10x14y+4=0

d

10x+14y+4=0  

answer is A.

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Detailed Solution

Given that one equation of a pair of dependent linear equations is 5x+7y=2 .
We know that pair of linear equations of two variables with x and y as a variable is represented as a 1 x+ b 1 y+ c 1 =0 and a 2 x+ b 2 y+ c 2 =0,where   a 1 , a 2 , b 1 , b 2 , c 1 , c 2 are constants.
Compare the ratios a 1 a 2 , b 1 b 2 and c 1 c 2 , to find the graph of a pair of linear equations either intersect at a point, are parallel or coincident.
Also, if the coefficients of both equations are multiples of each other, the equations are linearly dependent.
So, in the option (1), the equation 10x14y=4 can be expressed as 2(5x+7y)=2×2, which means it is -2 times the equation 5x+7y=2 .
Therefore, option (1) is correct.
 
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