Question

5/x+y-2/x-y=-1,15/x+y+7x-y=10 by cross multiplication​

Answer 1

let 1/x+y = a and 1/x-y = b

5a-2b= -1

15a+7b= 10

so 15a - 6b = -3

     15a + 7b =10

now subtracting the equations we get

a = 1

5*1 - 2b = -1

so b = 3

now 1/x+y = a =1

so x+y= 1

and 1/x-y = b

so x-y = 1/3

now solving both the equations we get

x= 4/3 and y = 1