Question

3.
4 /x +3/y=1 ____1
8/x -9/y=7______2​

Answer 1

Answer:

x=2. ;y=-3

Step-by-step explanation:

4/x+3/y=1. (1)

8/x-9/y=7. (2)

solution:-

From 1

multiplying xy on both sides of (1)

4y+3x=xy. (3)

From 2

multiplying xy on both sides of (2)

8y-9x=7xy. (4)

Now,

3×(3)+(4)

12y+9x=3xy

+8y-9x=7xy

20y=10xy

20y-10xy=0

y(20-10x)=0

(y=0; ignoring this value) ; x=2 put in (1)

4/2+3/y=1

2+3/y=1

3/y=-1

-y=3

y=-3