Question

25/x+y -7/x-y = -2. 15/x+y-7/x+y=-4. solve​

Answer 1

1/x+y =p, 1/x-y =q

25p-7q= -2

15p-7q= -4

-__+___+_

10p=2

p=5 sub in 1 eqn

125-7q= -2

7q=123

q=18(~)

5x+5y=1 be eqn 3

18x-18y=1 be eqn 4

5x+5y=18x-18y

5y+18y=18x-5x

23y=13x

y=13x/23

23x+65x=23

88x=23

x=23/88

y=13/23(23/88)

y=13/88