Question

15/u+2/v=17 ,1/u+1/v=36/5

Answer 1

15/u + 2/v =17--Eq.1
1/u+1/v=36/5--Eq.2
Multiple 15 in equation 2 and subtract from eq. 1 
2/v-15/v=17-(36*15)/5;
-13/v=-91;
13/91=v;
1/7=v put this value in eq. 2 or 1;
we get u=5

Answer 2

Hi ,

15/u + 2/v = 17 ---( 1 )

1/u + 1/v = 36/5 ---( 2 )

multiply equation ( 2 ) with 2 , we get

2/u + 2/v = 72/5 ---( 3 )

subtract equation ( 3 ) from equation ( 1 ),

we get

15/u - 2/u = 17 - 72/5

13/u = ( 85 - 72 )/5

13/u = 13/5

1/u = 13 / ( 5 × 13 )

1/u = 1/5

u = 5 --- ( 4 )

substitute u = 5 in equation ( 1 ) , we get

15/5 + 2/v = 17

3 + 2/v = 17

2/v = 17 - 3

2/v = 14

v/2 = 1/14

v = 2/14

v = 1/7

Therefore ,

u = 5 , v = 1/7

I hope this helps you.

: )