Question

if 4x+5y =10; 5x +4y = 17 , find the value of x=3​

Answer 1

Answer:

12+ 5y =10

5y=10-12

5y=-2/5

Answer 2

Answer:

Hey Mate!!

4x + 5y = 10     ...(1)

5x + 4y = 17     ...(2)

By (1) × 5, 20x + 25y = 50    ...(3)

By (2) × 4, 20x + 16y = 68    ...(4)

By (3) - (4),

20x + 25y - (20x + 16y) = 50 - 68

⇒ 20x + 25y - 20x - 16y = -18

⇒ 9y = -18

⇒ y = -2

By value of y in (1),

4x + 5(-2) = 10

⇒ 4x - 10 = 10

⇒ 4x = 20

⇒ x = 5