Question

Solve the pair of equations :
2/x+3/y=1
5/x-4/y=-7
Hence, find the value of 5x – 3y.
By substitution method ​

Answer 1

since we have given that

$\frac{2}{x} + \frac{3}{y} = 1$

$\frac{5}{x} - \frac{4}{y} = - 7$

let,

$\frac{1}{x} = u$

$\frac{1}{y} = v$

so, it becomes

$2u + 3v = 1$

$5u - 4v = - 7$

so, we get that

$u = 1$

$v = 3$

$\frac{1}{x} = 1$

$x = 1$

$\frac{1}{y} = 3$

$y = \frac{1}{3}$

so, it becomes

$5x - 3y = 5 - 3 \times \frac{1}{3}$

$= 5 - 1 = 4$

hence, the required value is 4.

Answer 2

Answer:

hyy here is your answer