Question

5/x+y-2/x-y= -1;15/x+y+7/x-y=10​

Answer 1

Answer:

Step-by-step explanation:

If  

15

(

2

x

2

−

y

2

)

=

7

x

y

,

, find  

x

:

y

;

if  

x

and  

y

both are positive.

Solution

15

(

2

x

2

−

y

2

)

=

7

x

y

⟹

30

x

2

−

7

x

y

−

15

y

2

=

0

solving for quadratic equation for  

x

We get  

x

=

7

y

±

43

y

60

x

=

5

y

/

6

,

−

3

y

/

10

6

x

−

5

y

=

0

   

10

x

+

3

y

=

0

⟹

x

y

=

5

6

 or  

x

y

=

−

3

10

   

Since  

x

and  

y

are positive so

x

:

y

5

:

6

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