Question

7. If 99x+101y= 1499 101x+99y = 1501, then x=​

Answer 1

Answer:

adding 1st and 2nd equation

200x + 200y = 3000

x + y = 15.......(3)

subtract 1st equation from 2nd

2x - 2y = 2

x - y = 1...........(4)

now adding 3rd and 4th equation

2x = 16

x = 8.