Question

5x-7y=4000 6x-9y=3000​

Answer 1

Answer:

X = 5000

Y = 3000

Step-by-step explanation:

5x-7y=4000   -- (i)

6x-9y=3000​   -- (ii)

From (i) => 5x =4000 + 7y

=> x = (4000 + 7y) / 5   --- (iii)

Put the value of (iii) in (ii) =>

6 { (4000 + 7y) / 5} - 9y = 3000

=> {(24000 + 42y) / 5} - 9y =3000

=> ( 24000 + 42y -45y) / 5 = 3000

=> 24000 + 42y -45y = 3000 * 5

=> 42y -45y = 15000 - 24000

=> - 3y = - 9000

=> 3y = 9000

=> y = 3000  ------ (iv)

Put the value of (iv) in (iii) =>

x = (4000 + 7 * 3000 ) / 5

=> x = 25000 / 5

=> x = 5000