Question

solve the following pair of equations for x and y :10/x+2/y=4,15/x-5/y=-2​

Answer 1

Answer:

Step-by-step explanation:

Let  

x+y

1

​

=u&  

x−y

1

​

=v

then  

(10u+2v=4)3

(15u−5v=−2)2

10u+2=4

u=  

5

1

​

 

−(30u−10v=−4)

__________________

     16v=16

__________________

v=1;u=  

5

1

​

=0.2

x+y

1

​

=  

5

1

​

;x+y=5

x−y

1

​

=1;x−y=1

x+y=5

x−y=1

_________

  2x=6

_________

x=3&y=2