Question

1. For what value of k, the pair of linear equations
2x - y - 3 = 0, 2kx + 7y - 5 = 0 has a unique
solution x = 1, y = -1 ?​

Answer 1

Answer:

this is your answer I hope it will help you

Answer 2

Answer:

6

Step-by-step explanation:

given ;

2x-y-3 =0 take this as equation 1

2kx+7y-5 =0 take this as equation 2

Multiply 1 equation by 7

14x-7y-21=0 - 3 equation

Equation 1 and 3

14x-7y-21=0

2kx+7y-5=0

By cancelling +7y and -7y we get,

14x+2kx-26 =0

14x+2kx =26 - 4th equation

as in the data they gave x=1

then equation 4will be

14+2k =26

2k= 26-14 =12

2k = 12

k = 12/2

k =6