Question

ex 3.6

solve by eliminating​

Answer 1

7x-2y =5xy

8x+7y=15×y

divide whole by xy ...

You will get

7/y-2/x =5 eq ..1

8/y+7/x=5 eq...2

let 1/x =n and 1/y =m

that gives,
7n-2m=5 ....eq3
8n+7m=15....eq4

multiply eq..3 by 7 and eq. 4 by 2

49n-14m=30

16n+14m= 35 add them

--------------------

65n = 65

n= 65/65 (n=1)

now n =1 in eq...5

7×1-2m=5

7-2m=5
-2m=5-7
-2m=-2
(m=1)

m=4

sub n=1 in eq..3
7×1-2m=5
-2m= -2
m=1
we know that n=1/x
x=1
m=1/y
y=1

HOP IT HELPS U STEP BY STEP EXPLANATION
mr.kotian4