Question

59. The equations x + 3y = 5 and 2x - by = 10
represent the same line, if b =
(A) 6
(B) – 5
(C) - 6
(D) None of these​

Answer 1

Answer:

(C) -6 is correct

In the first equation x + 3y = 5

the satisfying values are x= -1, y=2

In the second equation 2x - by =10

The satisfying values are x = -1, b = -6, y = 2

Answer 2

Answer:

let x + 3y= 5....equation 1

let 2x - by = 10.... equation 2

multiple equation 1 with 2

2x + 6y = 10.... equation 3

compare equation2with 3

-b = 6

or b = -6

Ans: on solving, the correct value of b is -6